Index: twitter.module
===================================================================
--- twitter.module	(revision 223)
+++ twitter.module	(working copy)
@@ -49,8 +49,9 @@
  */
 function twitter_form_alter(&$form, $form_state, $form_id) {
   module_load_include('inc', 'twitter');
-
-  if (substr($form_id, -10) == '_node_form') {
+  $type=substr($form_id, 0, -10);
+  $types=variable_get('twitter_types', array('story' => 'story', 'blog' => 'blog'));
+  if (substr($form_id, -10) == '_node_form' && $types['$type']) {
     $twitter_form = twitter_form();
     if (!$twitter_form) {
       return;