Earlier this week, security researcher Khalil Shreateh discovered a Facebook bug that allowed a hacker to post on anyone’s wall — even if they weren’t that person’s friend.
While he was able to prove to Facebook that his bug was legit (despite an initial response that it wasn’t a bug at all), Facebook wasn’t too happy with the way he did it: by using the bug to post on Zuckerberg’s otherwise friends-only wall.
Source: Tech Crunch. Read full article. (link)