static function Get_fb_groups_cached($user_ID)
 {
     global $blog_id;
     $groups_key = c_al2fb_transient_cache . md5('grp' . $blog_id . $user_ID);
     $groups = get_transient($groups_key);
     if (get_option(c_al2fb_option_debug)) {
         $groups = false;
     }
     if ($groups === false) {
         $groups = WPAL2Int::Get_fb_groups($user_ID);
         $duration = WPAL2Int::Get_duration(false);
         set_transient($groups_key, $groups, $duration);
     }
     return $groups;
 }