static function Get_fb_friends_cached($user_ID)
 {
     global $blog_id;
     $friends_key = c_al2fb_transient_cache . md5('frnd' . $blog_id . $user_ID);
     $friends = get_transient($friends_key);
     if (get_option(c_al2fb_option_debug)) {
         $friends = false;
     }
     if ($friends === false) {
         $friends = WPAL2Int::Get_fb_friends($user_ID);
         $duration = WPAL2Int::Get_duration(false);
         set_transient($friends_key, $friends, $duration);
     }
     return $friends;
 }