--- twitter.module	2009-11-15 21:43:09.000000000 +0300
+++ twitter.module.php	2009-11-16 20:07:44.000000000 +0300
@@ -91,7 +91,7 @@
     $form['twitter']['post'] = array(
       '#type' => 'checkbox',
       '#title' => t('Announce this post on Twitter'),
-      '#default_value' => (empty($form['nid']['#value'])),
+      '#default_value' => isset($form_state['values']['twitter']['post']) ? $form_state['values']['twitter']['post'] : (empty($form['nid']['#value'])),
       '#id' => 'twitter-toggle',
     );
     $form['twitter'] += $twitter_form;