离线fb张贴不工作

我不得不在他离线的时候在用户墙上发帖。我查看了张贴的次数，检查了下面写的代码，似乎还可以，也没有抛出错误，完全成功，但我无法在用户墙上看到张贴。Pl的帮助。

$facebook = new Facebook(
                array(
                   'appId'  => "446262598768110",
                   'secret' => "<REMOVED>",
                )
            );

 $facebook->setAccessToken("<REMOVED>");
//create message with token gained before
echo " lets try posting";
$access_token = $facebook->getAccessToken();
$user_id = $facebook->getUser();
echo "'ndone3..... $access_token.-----.$user_id.----new'n";

$post = array(
           'message' => 'This message is posted with access token - ' . date('Y-m-d H:i:s')
        );
//and make the request
$res = $facebook->api("/me/feed", 'GET', $post); //have tried both Post and Get method but result remain same