php sdk auto post on fanpage ทำไมเฟสของเพื่อนมองไม่เห็นแต่ของเราเห็นครับ

<?php

require_once('libs/facebook.php');
 
$config = array();
$config['appId'] = 'xxxxxxxxxxxxxxx';
$config['secret'] = 'xxxxxxxxxxxxxxx';
$config['fileUpload'] = false; // optional
$fb = new Facebook($config);
 
$params = array(
  // this is the access token for Fan Page
  "access_token" => "xxxxx",
  "message" => "Here is a blog post about auto posting on Facebook using PHP 
  #http://www.google.com",
 
  "picture" => "http://i.imgur.com/lHkOsiH.png",
  "name" => "How to Auto Post on Facebook with PHP",
  "caption" => "www.pontikis.net",
  "description" => "Automatically post on Facebook with PHP using Facebook PHP SDK. How to create a Facebook app. Obtain and extend Facebook access tokens. Cron automation."
);
 
try {
  // 466400200079875 is Facebook id of Fan page https://www.facebook.com/pontikis.net
  $ret = $fb->api('/210318209151660/feed', 'POST', $params);
  echo 'Successfully posted to Facebook Fan Page';
} catch(Exception $e) {
  echo $e->getMessage();
}
?>