--- twitter.module	2009-07-02 18:54:18.000000000 +0400
+++ twitter.module.php	2009-11-15 21:43:09.000000000 +0300
@@ -95,7 +95,7 @@
       '#id' => 'twitter-toggle',
     );
     $form['twitter'] += $twitter_form;
-    $form['twitter']['status']['#default_value'] = variable_get('twitter_default_format', 'New post: !title !tinyurl');
+    $form['twitter']['status']['#default_value'] = isset($form_state['values']['twitter']['status']) ? $form_state['values']['twitter']['status'] : variable_get('twitter_default_format', 'New post: !title !tinyurl');
     $form['twitter']['status']['#description'] = t('The given text will be posted to twitter.com. You can use !url, !url-alias, !tinyurl, !title and !user as replacement text.');
   }
 }