I am using the facebook javascript sdk to embed a like button in my page.
What is fb_xd_fragment? I see it appends to the end of my url like http://www.example.com/controller/?fb_xd_fragment, and this is causing some nasty recursive reload of the page.
The Channel hack did not work for me. So I just added above all other content in my PHP file some code that 301 redirects to the URL without the fb_xd_fragment addition:
$url = "http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
if (isset($_GET['fb_xd_fragment'])) {
$url = str_replace("?fb_xd_fragment=","",$url);
header( "HTTP/1.1 301 Moved Permanently" );
header("Location: {$url}");
exit();
}