php_action_link.php

<?php

// post to facebook - requires publish_actions permission
$post = $facebook->api( "me/feed", "POST", array(
    'message' => 'Testing custom search action',
    'actions' => array(
        'name' => 'Search',
        'link' => 'http://www.google.com'
      )
  ) );

// success will return id of post
print_r( $post );