Another vulnerability was found on Facebook early this morning by Mauritania Attacker which is also known the founder of AnonGhost Hackers.
The said vulnerability is not yet patched by Facebook Security team at this time, and you can see this in action.
Just open this link with your Facebook account logged out. http://apps.facebook.com/r.php?email=HACKED
You will be redirected to your news feed if you are currently logged in to Facebook, so logout first before you can see this in action.