public function UserBookmarkCount($UserID) {
      $Data = $this->SQL
         ->Select('ud.DiscussionID', 'count', 'Count')
         ->From('UserDiscussion ud')
         ->Join('Discussion d', 'd.DiscussionID = ud.DiscussionID')
         ->Where('ud.UserID', $UserID)
         ->Where('ud.Bookmarked', '1')
         ->Get()
         ->FirstRow();
         
      return $Data !== FALSE ? $Data->Count : 0;
   }