Workaround for third party cookies in Safari...

gistfile1.php

<?php 
// Start Session Fix
session_start();
$page_url = "http://www.facebook.com/pages/For-Testing/49209188225?sk=app_166147000244773";
if (isset($_GET["start_session"]))
{
	die(header("Location:" . $page_url));
}
$sid = session_id();
if (!isset($_GET["sid"]))
{
    	if(isset($_POST["signed_request"]))
    	{
       		$_SESSION["signed_request"] = $_POST["signed_request"];
   	}
    	die(header("Location:?sid=" . $sid));
}
if (empty($sid) || $_GET["sid"] != $sid)
{
	die('<script>top.window.location="?start_session=true";</script>');
}
// End Session Fix
  
?>