--- twitter_signin.module	2011-01-14 15:04:03.405084293 -0600
+++ twitter_signin.module.NEW	2011-01-14 15:03:34.194084703 -0600
@@ -55,6 +55,10 @@ function twitter_signin_user($op, &$edit
   if ($op == 'insert' && isset($_SESSION['twitter']['values'])) {
     unset($_SESSION['twitter']);
   }
+ 
+  if ($op == "delete") {
+    db_query("DELETE FROM {twitter_account} where uid=%s", $account->uid);
+  }
 }
 
 /**