diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 7716a29ce7..70c5ea2cf1 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -4272,12 +4272,15 @@ phutil_register_library_map(array(
     'PhameNextPostView' => 'applications/phame/view/PhameNextPostView.php',
     'PhamePost' => 'applications/phame/storage/PhamePost.php',
     'PhamePostArchiveController' => 'applications/phame/controller/post/PhamePostArchiveController.php',
+    'PhamePostBlogTransaction' => 'applications/phame/xaction/PhamePostBlogTransaction.php',
+    'PhamePostBodyTransaction' => 'applications/phame/xaction/PhamePostBodyTransaction.php',
     'PhamePostController' => 'applications/phame/controller/post/PhamePostController.php',
     'PhamePostEditConduitAPIMethod' => 'applications/phame/conduit/PhamePostEditConduitAPIMethod.php',
     'PhamePostEditController' => 'applications/phame/controller/post/PhamePostEditController.php',
     'PhamePostEditEngine' => 'applications/phame/editor/PhamePostEditEngine.php',
     'PhamePostEditor' => 'applications/phame/editor/PhamePostEditor.php',
     'PhamePostFulltextEngine' => 'applications/phame/search/PhamePostFulltextEngine.php',
+    'PhamePostHeaderImageTransaction' => 'applications/phame/xaction/PhamePostHeaderImageTransaction.php',
     'PhamePostHeaderPictureController' => 'applications/phame/controller/post/PhamePostHeaderPictureController.php',
     'PhamePostHistoryController' => 'applications/phame/controller/post/PhamePostHistoryController.php',
     'PhamePostListController' => 'applications/phame/controller/post/PhamePostListController.php',
@@ -4290,10 +4293,14 @@ phutil_register_library_map(array(
     'PhamePostReplyHandler' => 'applications/phame/mail/PhamePostReplyHandler.php',
     'PhamePostSearchConduitAPIMethod' => 'applications/phame/conduit/PhamePostSearchConduitAPIMethod.php',
     'PhamePostSearchEngine' => 'applications/phame/query/PhamePostSearchEngine.php',
+    'PhamePostSubtitleTransaction' => 'applications/phame/xaction/PhamePostSubtitleTransaction.php',
+    'PhamePostTitleTransaction' => 'applications/phame/xaction/PhamePostTitleTransaction.php',
     'PhamePostTransaction' => 'applications/phame/storage/PhamePostTransaction.php',
     'PhamePostTransactionComment' => 'applications/phame/storage/PhamePostTransactionComment.php',
     'PhamePostTransactionQuery' => 'applications/phame/query/PhamePostTransactionQuery.php',
+    'PhamePostTransactionType' => 'applications/phame/xaction/PhamePostTransactionType.php',
     'PhamePostViewController' => 'applications/phame/controller/post/PhamePostViewController.php',
+    'PhamePostVisibilityTransaction' => 'applications/phame/xaction/PhamePostVisibilityTransaction.php',
     'PhameSchemaSpec' => 'applications/phame/storage/PhameSchemaSpec.php',
     'PhameSite' => 'applications/phame/site/PhameSite.php',
     'PhluxController' => 'applications/phlux/controller/PhluxController.php',
@@ -9753,12 +9760,15 @@ phutil_register_library_map(array(
       'PhabricatorFulltextInterface',
     ),
     'PhamePostArchiveController' => 'PhamePostController',
+    'PhamePostBlogTransaction' => 'PhamePostTransactionType',
+    'PhamePostBodyTransaction' => 'PhamePostTransactionType',
     'PhamePostController' => 'PhameController',
     'PhamePostEditConduitAPIMethod' => 'PhabricatorEditEngineAPIMethod',
     'PhamePostEditController' => 'PhamePostController',
     'PhamePostEditEngine' => 'PhabricatorEditEngine',
     'PhamePostEditor' => 'PhabricatorApplicationTransactionEditor',
     'PhamePostFulltextEngine' => 'PhabricatorFulltextEngine',
+    'PhamePostHeaderImageTransaction' => 'PhamePostTransactionType',
     'PhamePostHeaderPictureController' => 'PhamePostController',
     'PhamePostHistoryController' => 'PhamePostController',
     'PhamePostListController' => 'PhamePostController',
@@ -9771,10 +9781,14 @@ phutil_register_library_map(array(
     'PhamePostReplyHandler' => 'PhabricatorApplicationTransactionReplyHandler',
     'PhamePostSearchConduitAPIMethod' => 'PhabricatorSearchEngineAPIMethod',
     'PhamePostSearchEngine' => 'PhabricatorApplicationSearchEngine',
-    'PhamePostTransaction' => 'PhabricatorApplicationTransaction',
+    'PhamePostSubtitleTransaction' => 'PhamePostTransactionType',
+    'PhamePostTitleTransaction' => 'PhamePostTransactionType',
+    'PhamePostTransaction' => 'PhabricatorModularTransaction',
     'PhamePostTransactionComment' => 'PhabricatorApplicationTransactionComment',
     'PhamePostTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
+    'PhamePostTransactionType' => 'PhabricatorModularTransactionType',
     'PhamePostViewController' => 'PhameLiveController',
+    'PhamePostVisibilityTransaction' => 'PhamePostTransactionType',
     'PhameSchemaSpec' => 'PhabricatorConfigSchemaSpec',
     'PhameSite' => 'PhabricatorSite',
     'PhluxController' => 'PhabricatorController',
diff --git a/src/applications/phame/controller/post/PhamePostArchiveController.php b/src/applications/phame/controller/post/PhamePostArchiveController.php
index 5a3b32944a..b8647121ef 100644
--- a/src/applications/phame/controller/post/PhamePostArchiveController.php
+++ b/src/applications/phame/controller/post/PhamePostArchiveController.php
@@ -26,7 +26,7 @@ final class PhamePostArchiveController extends PhamePostController {
 
       $new_value = PhameConstants::VISIBILITY_ARCHIVED;
       $xactions[] = id(new PhamePostTransaction())
-        ->setTransactionType(PhamePostTransaction::TYPE_VISIBILITY)
+        ->setTransactionType(PhamePostVisibilityTransaction::TRANSACTIONTYPE)
         ->setNewValue($new_value);
 
       id(new PhamePostEditor())
diff --git a/src/applications/phame/controller/post/PhamePostHeaderPictureController.php b/src/applications/phame/controller/post/PhamePostHeaderPictureController.php
index 2e60c9ba71..60075cc077 100644
--- a/src/applications/phame/controller/post/PhamePostHeaderPictureController.php
+++ b/src/applications/phame/controller/post/PhamePostHeaderPictureController.php
@@ -61,7 +61,7 @@ final class PhamePostHeaderPictureController
 
         $xactions = array();
         $xactions[] = id(new PhamePostTransaction())
-          ->setTransactionType(PhamePostTransaction::TYPE_HEADERIMAGE)
+          ->setTransactionType(PhamePostHeaderImageTransaction::TRANSACTIONTYPE)
           ->setNewValue($new_value);
 
         $editor = id(new PhamePostEditor())
diff --git a/src/applications/phame/controller/post/PhamePostMoveController.php b/src/applications/phame/controller/post/PhamePostMoveController.php
index 3e09a9ba2d..d088b260b5 100644
--- a/src/applications/phame/controller/post/PhamePostMoveController.php
+++ b/src/applications/phame/controller/post/PhamePostMoveController.php
@@ -28,7 +28,7 @@ final class PhamePostMoveController extends PhamePostController {
 
       $xactions = array();
       $xactions[] = id(new PhamePostTransaction())
-        ->setTransactionType(PhamePostTransaction::TYPE_BLOG)
+        ->setTransactionType(PhamePostBlogTransaction::TRANSACTIONTYPE)
         ->setNewValue($v_blog);
 
       $editor = id(new PhamePostEditor())
diff --git a/src/applications/phame/controller/post/PhamePostPublishController.php b/src/applications/phame/controller/post/PhamePostPublishController.php
index 567099f0d4..70989082bd 100644
--- a/src/applications/phame/controller/post/PhamePostPublishController.php
+++ b/src/applications/phame/controller/post/PhamePostPublishController.php
@@ -34,7 +34,7 @@ final class PhamePostPublishController extends PhamePostController {
       }
 
       $xactions[] = id(new PhamePostTransaction())
-        ->setTransactionType(PhamePostTransaction::TYPE_VISIBILITY)
+        ->setTransactionType(PhamePostVisibilityTransaction::TRANSACTIONTYPE)
         ->setNewValue($new_value);
 
       id(new PhamePostEditor())
diff --git a/src/applications/phame/editor/PhamePostEditEngine.php b/src/applications/phame/editor/PhamePostEditEngine.php
index e80c1f6d0d..af1b1091d1 100644
--- a/src/applications/phame/editor/PhamePostEditEngine.php
+++ b/src/applications/phame/editor/PhamePostEditEngine.php
@@ -84,7 +84,7 @@ final class PhamePostEditEngine
           pht('Choose a blog to create a post on (or move a post to).'))
         ->setConduitTypeDescription(pht('PHID of the blog.'))
         ->setAliases(array('blogPHID'))
-        ->setTransactionType(PhamePostTransaction::TYPE_BLOG)
+        ->setTransactionType(PhamePostBlogTransaction::TRANSACTIONTYPE)
         ->setHandleParameterType(new AphrontPHIDListHTTPParameterType())
         ->setSingleValue($blog_phid)
         ->setIsReorderable(false)
@@ -97,7 +97,7 @@ final class PhamePostEditEngine
         ->setDescription(pht('Post title.'))
         ->setConduitDescription(pht('Retitle the post.'))
         ->setConduitTypeDescription(pht('New post title.'))
-        ->setTransactionType(PhamePostTransaction::TYPE_TITLE)
+        ->setTransactionType(PhamePostTitleTransaction::TRANSACTIONTYPE)
         ->setValue($object->getTitle()),
       id(new PhabricatorTextEditField())
         ->setKey('subtitle')
@@ -105,7 +105,7 @@ final class PhamePostEditEngine
         ->setDescription(pht('Post subtitle.'))
         ->setConduitDescription(pht('Change the post subtitle.'))
         ->setConduitTypeDescription(pht('New post subtitle.'))
-        ->setTransactionType(PhamePostTransaction::TYPE_SUBTITLE)
+        ->setTransactionType(PhamePostSubtitleTransaction::TRANSACTIONTYPE)
         ->setValue($object->getSubtitle()),
       id(new PhabricatorSelectEditField())
         ->setKey('visibility')
@@ -113,7 +113,7 @@ final class PhamePostEditEngine
         ->setDescription(pht('Post visibility.'))
         ->setConduitDescription(pht('Change post visibility.'))
         ->setConduitTypeDescription(pht('New post visibility constant.'))
-        ->setTransactionType(PhamePostTransaction::TYPE_VISIBILITY)
+        ->setTransactionType(PhamePostVisibilityTransaction::TRANSACTIONTYPE)
         ->setValue($object->getVisibility())
         ->setOptions(PhameConstants::getPhamePostStatusMap()),
       id(new PhabricatorRemarkupEditField())
@@ -122,7 +122,7 @@ final class PhamePostEditEngine
         ->setDescription(pht('Post body.'))
         ->setConduitDescription(pht('Change post body.'))
         ->setConduitTypeDescription(pht('New post body.'))
-        ->setTransactionType(PhamePostTransaction::TYPE_BODY)
+        ->setTransactionType(PhamePostBodyTransaction::TRANSACTIONTYPE)
         ->setValue($object->getBody())
         ->setPreviewPanel(
           id(new PHUIRemarkupPreviewPanel())
diff --git a/src/applications/phame/editor/PhamePostEditor.php b/src/applications/phame/editor/PhamePostEditor.php
index 929613fe80..8f0e2b5099 100644
--- a/src/applications/phame/editor/PhamePostEditor.php
+++ b/src/applications/phame/editor/PhamePostEditor.php
@@ -11,177 +11,21 @@ final class PhamePostEditor
     return pht('Phame Posts');
   }
 
+  public function getCreateObjectTitle($author, $object) {
+    return pht('%s created this post.', $author);
+  }
+
+  public function getCreateObjectTitleForFeed($author, $object) {
+    return pht('%s created %s.', $author, $object);
+  }
+
   public function getTransactionTypes() {
     $types = parent::getTransactionTypes();
-
-    $types[] = PhamePostTransaction::TYPE_BLOG;
-    $types[] = PhamePostTransaction::TYPE_TITLE;
-    $types[] = PhamePostTransaction::TYPE_SUBTITLE;
-    $types[] = PhamePostTransaction::TYPE_BODY;
-    $types[] = PhamePostTransaction::TYPE_VISIBILITY;
-    $types[] = PhamePostTransaction::TYPE_HEADERIMAGE;
     $types[] = PhabricatorTransactions::TYPE_COMMENT;
 
     return $types;
   }
 
-  protected function getCustomTransactionOldValue(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhamePostTransaction::TYPE_BLOG:
-        return $object->getBlogPHID();
-      case PhamePostTransaction::TYPE_TITLE:
-        return $object->getTitle();
-      case PhamePostTransaction::TYPE_SUBTITLE:
-        return $object->getSubtitle();
-      case PhamePostTransaction::TYPE_BODY:
-        return $object->getBody();
-      case PhamePostTransaction::TYPE_VISIBILITY:
-        return $object->getVisibility();
-      case PhamePostTransaction::TYPE_HEADERIMAGE:
-        return $object->getHeaderImagePHID();
-    }
-  }
-
-  protected function getCustomTransactionNewValue(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhamePostTransaction::TYPE_TITLE:
-      case PhamePostTransaction::TYPE_SUBTITLE:
-      case PhamePostTransaction::TYPE_BODY:
-      case PhamePostTransaction::TYPE_VISIBILITY:
-      case PhamePostTransaction::TYPE_HEADERIMAGE:
-      case PhamePostTransaction::TYPE_BLOG:
-        return $xaction->getNewValue();
-    }
-  }
-
-  protected function applyCustomInternalTransaction(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhamePostTransaction::TYPE_TITLE:
-        return $object->setTitle($xaction->getNewValue());
-      case PhamePostTransaction::TYPE_SUBTITLE:
-        return $object->setSubtitle($xaction->getNewValue());
-      case PhamePostTransaction::TYPE_BODY:
-        return $object->setBody($xaction->getNewValue());
-      case PhamePostTransaction::TYPE_BLOG:
-        return $object->setBlogPHID($xaction->getNewValue());
-      case PhamePostTransaction::TYPE_HEADERIMAGE:
-        return $object->setHeaderImagePHID($xaction->getNewValue());
-      case PhamePostTransaction::TYPE_VISIBILITY:
-        if ($xaction->getNewValue() == PhameConstants::VISIBILITY_DRAFT) {
-          $object->setDatePublished(0);
-        } else if ($xaction->getNewValue() ==
-          PhameConstants::VISIBILITY_ARCHIVED) {
-            $object->setDatePublished(0);
-        } else {
-          $object->setDatePublished(PhabricatorTime::getNow());
-        }
-        return $object->setVisibility($xaction->getNewValue());
-    }
-
-    return parent::applyCustomInternalTransaction($object, $xaction);
-  }
-
-  protected function applyCustomExternalTransaction(
-    PhabricatorLiskDAO $object,
-    PhabricatorApplicationTransaction $xaction) {
-
-    switch ($xaction->getTransactionType()) {
-      case PhamePostTransaction::TYPE_TITLE:
-      case PhamePostTransaction::TYPE_SUBTITLE:
-      case PhamePostTransaction::TYPE_BODY:
-      case PhamePostTransaction::TYPE_VISIBILITY:
-      case PhamePostTransaction::TYPE_HEADERIMAGE:
-      case PhamePostTransaction::TYPE_BLOG:
-        return;
-    }
-
-    return parent::applyCustomExternalTransaction($object, $xaction);
-  }
-
-  protected function validateTransaction(
-    PhabricatorLiskDAO $object,
-    $type,
-    array $xactions) {
-
-    $errors = parent::validateTransaction($object, $type, $xactions);
-
-    switch ($type) {
-      case PhamePostTransaction::TYPE_TITLE:
-        $missing = $this->validateIsEmptyTextField(
-          $object->getTitle(),
-          $xactions);
-
-        if ($missing) {
-          $error = new PhabricatorApplicationTransactionValidationError(
-            $type,
-            pht('Required'),
-            pht('Title is required.'),
-            nonempty(last($xactions), null));
-
-          $error->setIsMissingFieldError(true);
-          $errors[] = $error;
-        }
-        break;
-      case PhamePostTransaction::TYPE_BLOG:
-        if ($this->getIsNewObject()) {
-          if (!$xactions) {
-            $error = new PhabricatorApplicationTransactionValidationError(
-              $type,
-              pht('Required'),
-              pht(
-                'When creating a post, you must specify which blog it '.
-                'should belong to.'),
-              null);
-
-            $error->setIsMissingFieldError(true);
-
-            $errors[] = $error;
-            break;
-          }
-        }
-
-        foreach ($xactions as $xaction) {
-          $new_phid = $xaction->getNewValue();
-
-          $blog = id(new PhameBlogQuery())
-            ->setViewer($this->getActor())
-            ->withPHIDs(array($new_phid))
-            ->requireCapabilities(
-              array(
-                PhabricatorPolicyCapability::CAN_VIEW,
-                PhabricatorPolicyCapability::CAN_EDIT,
-              ))
-            ->execute();
-
-          if ($blog) {
-            continue;
-          }
-
-          $errors[] = new PhabricatorApplicationTransactionValidationError(
-            $type,
-            pht('Invalid'),
-            pht(
-              'The specified blog PHID ("%s") is not valid. You can only '.
-              'create a post on (or move a post into) a blog which you '.
-              'have permission to see and edit.',
-              $new_phid),
-            $xaction);
-        }
-
-        break;
-    }
-    return $errors;
-  }
-
   protected function shouldSendMail(
     PhabricatorLiskDAO $object,
     array $xactions) {
diff --git a/src/applications/phame/storage/PhamePostTransaction.php b/src/applications/phame/storage/PhamePostTransaction.php
index 6e54aeda6d..1c259911f3 100644
--- a/src/applications/phame/storage/PhamePostTransaction.php
+++ b/src/applications/phame/storage/PhamePostTransaction.php
@@ -1,14 +1,7 @@
 <?php
 
 final class PhamePostTransaction
-  extends PhabricatorApplicationTransaction {
-
-  const TYPE_TITLE            = 'phame.post.title';
-  const TYPE_SUBTITLE         = 'phame.post.subtitle';
-  const TYPE_BODY             = 'phame.post.body';
-  const TYPE_VISIBILITY       = 'phame.post.visibility';
-  const TYPE_HEADERIMAGE      = 'phame.post.headerimage';
-  const TYPE_BLOG             = 'phame.post.blog';
+  extends PhabricatorModularTransaction {
 
   const MAILTAG_CONTENT       = 'phame-post-content';
   const MAILTAG_SUBSCRIBERS   = 'phame-post-subscribers';
@@ -23,71 +16,14 @@ final class PhamePostTransaction
     return PhabricatorPhamePostPHIDType::TYPECONST;
   }
 
+  public function getBaseTransactionClass() {
+    return 'PhamePostTransactionType';
+  }
+
   public function getApplicationTransactionCommentObject() {
     return new PhamePostTransactionComment();
   }
 
-  public function getRemarkupBlocks() {
-    $blocks = parent::getRemarkupBlocks();
-
-    switch ($this->getTransactionType()) {
-      case self::TYPE_BODY:
-        $blocks[] = $this->getNewValue();
-        break;
-    }
-
-    return $blocks;
-  }
-
-  public function shouldHide() {
-    return parent::shouldHide();
-  }
-
-  public function getRequiredHandlePHIDs() {
-    $phids = parent::getRequiredHandlePHIDs();
-
-    switch ($this->getTransactionType()) {
-      case self::TYPE_BLOG:
-        $old = $this->getOldValue();
-        $new = $this->getNewValue();
-
-        if ($old) {
-          $phids[] = $old;
-        }
-
-        if ($new) {
-          $phids[] = $new;
-        }
-        break;
-    }
-
-    return $phids;
-  }
-
-
-  public function getIcon() {
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-    switch ($this->getTransactionType()) {
-      case PhabricatorTransactions::TYPE_CREATE:
-        return 'fa-plus';
-      break;
-      case self::TYPE_HEADERIMAGE:
-        return 'fa-camera-retro';
-      break;
-      case self::TYPE_VISIBILITY:
-        if ($new == PhameConstants::VISIBILITY_PUBLISHED) {
-          return 'fa-globe';
-        } else if ($new == PhameConstants::VISIBILITY_ARCHIVED) {
-          return 'fa-ban';
-        } else {
-          return 'fa-eye-slash';
-        }
-      break;
-    }
-    return parent::getIcon();
-  }
-
   public function getMailTags() {
     $tags = parent::getMailTags();
 
@@ -110,200 +46,4 @@ final class PhamePostTransaction
     return $tags;
   }
 
-
-  public function getTitle() {
-    $author_phid = $this->getAuthorPHID();
-    $object_phid = $this->getObjectPHID();
-
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-
-    $type = $this->getTransactionType();
-    switch ($type) {
-      case PhabricatorTransactions::TYPE_CREATE:
-        return pht(
-          '%s authored this post.',
-          $this->renderHandleLink($author_phid));
-      case self::TYPE_BLOG:
-        return pht(
-          '%s moved this post from "%s" to "%s".',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($old),
-          $this->renderHandleLink($new));
-      case self::TYPE_TITLE:
-        if ($old === null) {
-          return pht(
-            '%s authored this post.',
-            $this->renderHandleLink($author_phid));
-        } else {
-          return pht(
-            '%s updated the post\'s name to "%s".',
-            $this->renderHandleLink($author_phid),
-            $new);
-        }
-        break;
-      case self::TYPE_SUBTITLE:
-        if ($old === null) {
-          return pht(
-            '%s set the post\'s subtitle to "%s".',
-            $this->renderHandleLink($author_phid),
-            $new);
-        } else {
-          return pht(
-            '%s updated the post\'s subtitle to "%s".',
-            $this->renderHandleLink($author_phid),
-            $new);
-        }
-        break;
-      case self::TYPE_BODY:
-        return pht(
-          '%s updated the blog post.',
-          $this->renderHandleLink($author_phid));
-        break;
-      case self::TYPE_HEADERIMAGE:
-        return pht(
-          '%s updated the header image.',
-          $this->renderHandleLink($author_phid));
-        break;
-      case self::TYPE_VISIBILITY:
-        if ($new == PhameConstants::VISIBILITY_DRAFT) {
-          return pht(
-            '%s marked this post as a draft.',
-            $this->renderHandleLink($author_phid));
-        } else if ($new == PhameConstants::VISIBILITY_ARCHIVED) {
-          return pht(
-            '%s archived this post.',
-            $this->renderHandleLink($author_phid));
-        } else {
-          return pht(
-          '%s published this post.',
-          $this->renderHandleLink($author_phid));
-        }
-        break;
-    }
-
-    return parent::getTitle();
-  }
-
-  public function getTitleForFeed() {
-    $author_phid = $this->getAuthorPHID();
-    $object_phid = $this->getObjectPHID();
-
-    $old = $this->getOldValue();
-    $new = $this->getNewValue();
-
-    $type = $this->getTransactionType();
-    switch ($type) {
-      case PhabricatorTransactions::TYPE_CREATE:
-        return pht(
-          '%s authored %s.',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($object_phid));
-      case self::TYPE_BLOG:
-        return pht(
-          '%s moved post "%s" from "%s" to "%s".',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($object_phid),
-          $this->renderHandleLink($old),
-          $this->renderHandleLink($new));
-      case self::TYPE_TITLE:
-        if ($old === null) {
-          return pht(
-            '%s authored %s.',
-            $this->renderHandleLink($author_phid),
-            $this->renderHandleLink($object_phid));
-        } else {
-          return pht(
-            '%s updated the name for %s.',
-            $this->renderHandleLink($author_phid),
-            $this->renderHandleLink($object_phid));
-        }
-        break;
-      case self::TYPE_SUBTITLE:
-        return pht(
-            '%s updated the subtitle for %s.',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($object_phid));
-        break;
-      case self::TYPE_BODY:
-        return pht(
-          '%s updated the blog post %s.',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($object_phid));
-        break;
-      case self::TYPE_HEADERIMAGE:
-        return pht(
-          '%s updated the header image for post %s.',
-          $this->renderHandleLink($author_phid),
-          $this->renderHandleLink($object_phid));
-        break;
-      case self::TYPE_VISIBILITY:
-        if ($new == PhameConstants::VISIBILITY_DRAFT) {
-          return pht(
-            '%s marked %s as a draft.',
-            $this->renderHandleLink($author_phid),
-            $this->renderHandleLink($object_phid));
-        } else if ($new == PhameConstants::VISIBILITY_ARCHIVED) {
-          return pht(
-            '%s marked %s as archived.',
-            $this->renderHandleLink($author_phid),
-            $this->renderHandleLink($object_phid));
-        } else {
-          return pht(
-            '%s published %s.',
-            $this->renderHandleLink($author_phid),
-            $this->renderHandleLink($object_phid));
-        }
-        break;
-    }
-
-    return parent::getTitleForFeed();
-  }
-
-  public function getRemarkupBodyForFeed(PhabricatorFeedStory $story) {
-    $old = $this->getOldValue();
-
-    switch ($this->getTransactionType()) {
-      case self::TYPE_BODY:
-        if ($old === null) {
-          return $this->getNewValue();
-        }
-      break;
-    }
-
-    return null;
-  }
-
-  public function getColor() {
-    switch ($this->getTransactionType()) {
-      case PhabricatorTransactions::TYPE_CREATE:
-        return PhabricatorTransactions::COLOR_GREEN;
-    }
-    return parent::getColor();
-  }
-
-  public function hasChangeDetails() {
-    switch ($this->getTransactionType()) {
-      case self::TYPE_BODY:
-        return ($this->getOldValue() !== null);
-    }
-
-    return parent::hasChangeDetails();
-  }
-
-  public function renderChangeDetails(PhabricatorUser $viewer) {
-    switch ($this->getTransactionType()) {
-      case self::TYPE_BODY:
-        $old = $this->getOldValue();
-        $new = $this->getNewValue();
-
-        return $this->renderTextCorpusChangeDetails(
-          $viewer,
-          $old,
-          $new);
-    }
-
-    return parent::renderChangeDetails($viewer);
-  }
-
 }
diff --git a/src/applications/phame/xaction/PhameBlogNameTransaction.php b/src/applications/phame/xaction/PhameBlogNameTransaction.php
index dbca5304a8..c219ba494b 100644
--- a/src/applications/phame/xaction/PhameBlogNameTransaction.php
+++ b/src/applications/phame/xaction/PhameBlogNameTransaction.php
@@ -23,7 +23,7 @@ final class PhameBlogNameTransaction
 
   public function getTitleForFeed() {
     return pht(
-      '%s renamed %s blog froms %s to %s.',
+      '%s renamed %s blog from %s to %s.',
       $this->renderAuthor(),
       $this->renderObject(),
       $this->renderOldValue(),
diff --git a/src/applications/phame/xaction/PhameBlogStatusTransaction.php b/src/applications/phame/xaction/PhameBlogStatusTransaction.php
index 21345ea249..b3366bece7 100644
--- a/src/applications/phame/xaction/PhameBlogStatusTransaction.php
+++ b/src/applications/phame/xaction/PhameBlogStatusTransaction.php
@@ -45,11 +45,11 @@ final class PhameBlogStatusTransaction
 
   public function getIcon() {
     $new = $this->getNewValue();
-      if ($new == PhameBlog::STATUS_ARCHIVED) {
-        return 'fa-ban';
-      } else {
-        return 'fa-check';
-      }
+    if ($new == PhameBlog::STATUS_ARCHIVED) {
+      return 'fa-ban';
+    } else {
+      return 'fa-check';
     }
+  }
 
 }
diff --git a/src/applications/phame/xaction/PhamePostBlogTransaction.php b/src/applications/phame/xaction/PhamePostBlogTransaction.php
new file mode 100644
index 0000000000..cfe335a6ce
--- /dev/null
+++ b/src/applications/phame/xaction/PhamePostBlogTransaction.php
@@ -0,0 +1,64 @@
+<?php
+
+final class PhamePostBlogTransaction
+  extends PhamePostTransactionType {
+
+  const TRANSACTIONTYPE = 'phame.post.blog';
+
+  public function generateOldValue($object) {
+    return $object->getBlogPHID();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setBlogPHID($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s changed the blog for this post.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s changed the blog for post %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $errors = array();
+
+    if ($this->isEmptyTextTransaction($object->getBlogPHID(), $xactions)) {
+      $errors[] = $this->newRequiredError(
+        pht('Posts must be attached to a blog.'));
+    }
+
+    foreach ($xactions as $xaction) {
+      $new_phid = $xaction->getNewValue();
+
+      $blog = id(new PhameBlogQuery())
+        ->setViewer($this->getActor())
+        ->withPHIDs(array($new_phid))
+        ->requireCapabilities(
+          array(
+            PhabricatorPolicyCapability::CAN_VIEW,
+            PhabricatorPolicyCapability::CAN_EDIT,
+          ))
+        ->execute();
+
+      if ($blog) {
+        continue;
+      }
+
+      $errors[] = $this->newInvalidError(
+        pht('The specified blog PHID ("%s") is not valid. You can only '.
+            'create a post on (or move a post into) a blog which you '.
+            'have permission to see and edit.',
+            $new_phid));
+    }
+
+    return $errors;
+  }
+
+}
diff --git a/src/applications/phame/xaction/PhamePostBodyTransaction.php b/src/applications/phame/xaction/PhamePostBodyTransaction.php
new file mode 100644
index 0000000000..bf34cf73ff
--- /dev/null
+++ b/src/applications/phame/xaction/PhamePostBodyTransaction.php
@@ -0,0 +1,60 @@
+<?php
+
+final class PhamePostBodyTransaction
+  extends PhamePostTransactionType {
+
+  const TRANSACTIONTYPE = 'phame.post.body';
+
+  public function generateOldValue($object) {
+    return $object->getBody();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setBody($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s updated the post content.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s updated the post content for %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+  public function hasChangeDetailView() {
+    return true;
+  }
+
+  public function getMailDiffSectionHeader() {
+    return pht('CHANGES TO POST CONTENT');
+  }
+
+  public function newChangeDetailView() {
+    $viewer = $this->getViewer();
+
+    return id(new PhabricatorApplicationTransactionTextDiffDetailView())
+      ->setViewer($viewer)
+      ->setOldText($this->getOldValue())
+      ->setNewText($this->getNewValue());
+  }
+
+  public function newRemarkupChanges() {
+    $changes = array();
+
+    $changes[] = $this->newRemarkupChange()
+      ->setOldValue($this->getOldValue())
+      ->setNewValue($this->getNewValue());
+
+    return $changes;
+  }
+
+  public function getIcon() {
+    return 'fa-file-text-o';
+  }
+
+}
diff --git a/src/applications/phame/xaction/PhamePostHeaderImageTransaction.php b/src/applications/phame/xaction/PhamePostHeaderImageTransaction.php
new file mode 100644
index 0000000000..2b9631cdc4
--- /dev/null
+++ b/src/applications/phame/xaction/PhamePostHeaderImageTransaction.php
@@ -0,0 +1,33 @@
+<?php
+
+final class PhamePostHeaderImageTransaction
+  extends PhamePostTransactionType {
+
+  const TRANSACTIONTYPE = 'phame.post.headerimage';
+
+  public function generateOldValue($object) {
+    return $object->getHeaderImagePHID();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setHeaderImagePHID($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s changed the header image for this post.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s changed the header image for post %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+  public function getIcon() {
+    return 'fa-camera';
+  }
+
+}
diff --git a/src/applications/phame/xaction/PhamePostSubtitleTransaction.php b/src/applications/phame/xaction/PhamePostSubtitleTransaction.php
new file mode 100644
index 0000000000..05b0f34790
--- /dev/null
+++ b/src/applications/phame/xaction/PhamePostSubtitleTransaction.php
@@ -0,0 +1,63 @@
+<?php
+
+final class PhamePostSubtitleTransaction
+  extends PhamePostTransactionType {
+
+  const TRANSACTIONTYPE = 'phame.post.subtitle';
+
+  public function generateOldValue($object) {
+    return $object->getSubtitle();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setSubtitle($value);
+  }
+
+  public function getTitle() {
+    $old = $this->getOldValue();
+    if ($old === null) {
+      return pht(
+        '%s set this post\'s subtitle to "%s".',
+        $this->renderAuthor(),
+        $this->renderNewValue());
+    } else {
+      return pht(
+        '%s updated the post\'s subtitle to "%s".',
+        $this->renderAuthor(),
+        $this->renderNewValue());
+    }
+  }
+
+  public function getTitleForFeed() {
+    $old = $this->getOldValue();
+    if ($old === null) {
+      return pht(
+        '%s set the subtitle for %s.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    } else {
+      return pht(
+        '%s updated the subtitle for %s.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    }
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $errors = array();
+
+    $max_length = $object->getColumnMaximumByteLength('subtitle');
+    foreach ($xactions as $xaction) {
+      $new_value = $xaction->getNewValue();
+      $new_length = strlen($new_value);
+      if ($new_length > $max_length) {
+        $errors[] = $this->newInvalidError(
+          pht('The subtitle can be no longer than %s characters.',
+          new PhutilNumber($max_length)));
+      }
+    }
+
+    return $errors;
+  }
+
+}
diff --git a/src/applications/phame/xaction/PhamePostTitleTransaction.php b/src/applications/phame/xaction/PhamePostTitleTransaction.php
new file mode 100644
index 0000000000..99c556cc3a
--- /dev/null
+++ b/src/applications/phame/xaction/PhamePostTitleTransaction.php
@@ -0,0 +1,55 @@
+<?php
+
+final class PhamePostTitleTransaction
+  extends PhamePostTransactionType {
+
+  const TRANSACTIONTYPE = 'phame.post.title';
+
+  public function generateOldValue($object) {
+    return $object->getTitle();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    $object->setTitle($value);
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s renamed this blog post from %s to %s.',
+      $this->renderAuthor(),
+      $this->renderOldValue(),
+      $this->renderNewValue());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s renamed %s blog post from %s to %s.',
+      $this->renderAuthor(),
+      $this->renderObject(),
+      $this->renderOldValue(),
+      $this->renderNewValue());
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $errors = array();
+
+    if ($this->isEmptyTextTransaction($object->getTitle(), $xactions)) {
+      $errors[] = $this->newRequiredError(
+        pht('Posts must have a title.'));
+    }
+
+    $max_length = $object->getColumnMaximumByteLength('title');
+    foreach ($xactions as $xaction) {
+      $new_value = $xaction->getNewValue();
+      $new_length = strlen($new_value);
+      if ($new_length > $max_length) {
+        $errors[] = $this->newInvalidError(
+          pht('The title can be no longer than %s characters.',
+          new PhutilNumber($max_length)));
+      }
+    }
+
+    return $errors;
+  }
+
+}
diff --git a/src/applications/phame/xaction/PhamePostTransactionType.php b/src/applications/phame/xaction/PhamePostTransactionType.php
new file mode 100644
index 0000000000..b8ce182bc7
--- /dev/null
+++ b/src/applications/phame/xaction/PhamePostTransactionType.php
@@ -0,0 +1,4 @@
+<?php
+
+abstract class PhamePostTransactionType
+  extends PhabricatorModularTransactionType {}
diff --git a/src/applications/phame/xaction/PhamePostVisibilityTransaction.php b/src/applications/phame/xaction/PhamePostVisibilityTransaction.php
new file mode 100644
index 0000000000..9c08787e98
--- /dev/null
+++ b/src/applications/phame/xaction/PhamePostVisibilityTransaction.php
@@ -0,0 +1,70 @@
+<?php
+
+final class PhamePostVisibilityTransaction
+  extends PhamePostTransactionType {
+
+  const TRANSACTIONTYPE = 'phame.post.visibility';
+
+  public function generateOldValue($object) {
+    return $object->getVisibility();
+  }
+
+  public function applyInternalEffects($object, $value) {
+    if ($value == PhameConstants::VISIBILITY_DRAFT) {
+      $object->setDatePublished(0);
+    } else if ($value == PhameConstants::VISIBILITY_ARCHIVED) {
+      $object->setDatePublished(0);
+    } else {
+      $object->setDatePublished(PhabricatorTime::getNow());
+    }
+    $object->setVisibility($value);
+  }
+
+  public function getTitle() {
+    $new = $this->getNewValue();
+    if ($new == PhameConstants::VISIBILITY_DRAFT) {
+      return pht(
+        '%s marked this post as a draft.',
+        $this->renderAuthor());
+    } else if ($new == PhameConstants::VISIBILITY_ARCHIVED) {
+      return pht(
+        '%s archived this post.',
+        $this->renderAuthor());
+    } else {
+      return pht(
+      '%s published this post.',
+      $this->renderAuthor());
+    }
+  }
+
+  public function getTitleForFeed() {
+    $new = $this->getNewValue();
+    if ($new == PhameConstants::VISIBILITY_DRAFT) {
+      return pht(
+        '%s marked %s as a draft.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    } else if ($new == PhameConstants::VISIBILITY_ARCHIVED) {
+      return pht(
+        '%s marked %s as archived.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    } else {
+      return pht(
+        '%s published %s.',
+        $this->renderAuthor(),
+        $this->renderObject());
+    }
+  }
+
+  public function getIcon() {
+    $new = $this->getNewValue();
+    if ($new == PhameConstants::VISIBILITY_PUBLISHED) {
+      return 'fa-rss';
+    } else if ($new == PhameConstants::VISIBILITY_ARCHIVED) {
+      return 'fa-ban';
+    } else {
+      return 'fa-eye-slash';
+    }
+  }
+}