This is the code facebook embedded in its pages.
if (top != self) { try { if (parent != top) { throw 1; }
This code checks if its embedded in iframe its blocks loading other data rather loads the the link to which you can click with an image.
<script type="text/javascript">
/* <![CDATA[ */if (top != self) {
try { if (parent != top) { throw 1; }
var disallowed = ["apps.facebook.com","/pages/","apps.beta.facebook.com"];
href = top.location.href.toLowerCase();
for (var i = 0; i < disallowed.length; i++) {
if (href.indexOf(disallowed[i]) >= 0) { throw 1; }
}
} catch (e) {
setTimeout(
function() {var fb_cj_img = new Image();
fb_cj_img.src = "http://error.facebook.com/common/scribe_endpoint.php?c=si_clickjacking&m=onu002509&t=8183";}, 5000);
window.document.write("u003cstyle>body * { display:none !important; }u003c/style>u003ca href="#" onclick="top.location.href=window.location.href" style="display: block !important; padding: 10px">u003ci class="img sp_8dfqpl sx_d67a9a" style="display:block !important">u003c/i>Go to Facebook.comu003c/a>");
/* XRCm4Hhw */ }}/* ]]> *
</script>
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