Collected research
How Facebook lacked X-Frame-Options and what I did with it
Facebook's serverfbml.php plugin endpoint relied on JavaScript frame-busting and sent no X-Frame-Options header. Framing it under view-source: in Firefox and using a double drag-and-drop UI redressing game, an attacker could pull the page's HTML source cross-origin, harvesting the victim's user ID and the fb_dtsg and post_form_id anti-CSRF tokens, then post statuses and send friend requests.
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