Move Twitter and Facebook-specific mail notifications to their respective plugins

plugins/Facebook/facebookutil.php

@@ -258,3 +258,38 @@ function remove_facebook_app($flink)
     }
 
 }
+
+/**
+ * Send a mail message to notify a user that her Facebook Application
+ * access has been removed.
+ *
+ * @param User $user   user whose Facebook app link has been removed
+ *
+ * @return boolean success flag
+ */
+
+function mail_facebook_app_removed($user)
+{
+    common_init_locale($user->language);
+
+    $profile = $user->getProfile();
+
+    $site_name = common_config('site', 'name');
+
+    $subject = sprintf(
+        _('Your %1$s Facebook application access has been disabled.',
+            $site_name));
+
+    $body = sprintf(_("Hi, %1\$s. We're sorry to inform you that we are " .
+        'unable to update your Facebook status from %2$s, and have disabled ' .
+        'the Facebook application for your account. This may be because ' .
+        'you have removed the Facebook application\'s authorization, or ' .
+        'have deleted your Facebook account.  You can re-enable the ' .
+        'Facebook application and automatic status updating by ' .
+        "re-installing the %2\$s Facebook application.\n\nRegards,\n\n%2\$s"),
+        $user->nickname, $site_name);
+
+    common_init_locale();
+    return mail_to_user($user, $subject, $body);
+
+}