Khalil Shreateh is a Palistinian bug hunter who discovered a Facebook vulnerability that allows a user to post to other user's timeline even if he/she is not in his/her friend list. He reported this bug to www.facebook.com/whitehat but Emrakul of Facebook Security team denied his bug despite reporting the bug twice.Knowing he had a legitimate exploit and Facebook wasn’t going to fix it, Khalil decided to take much more drastic and public action. He proceeded to use the exploit to post his bug report on Mark Zuckerberg’s own wall. As you’d expect, it only took a few minutes for Facebook to notice the post and contact Khalil to find out more about how he’d managed to circumvent the user account security.