static function Get_fb_comments_cached($user_ID, $link_id, $cached = true)
 {
     global $blog_id;
     $fb_key = c_al2fb_transient_cache . md5('c' . $blog_id . $user_ID . $link_id);
     $fb_comments = get_transient($fb_key);
     if (get_option(c_al2fb_option_debug) || !$cached) {
         $fb_comments = false;
     }
     if ($fb_comments === false) {
         $fb_comments = WPAL2Int::Get_fb_comments($user_ID, $link_id);
         $duration = WPAL2Int::Get_duration(true);
         set_transient($fb_key, $fb_comments, $duration);
     }
     return $fb_comments;
 }