In apologizing for the move, Facebook said that it examines "millions" of ad images each week and sometimes bans them by mistake. There's no denying that the internet giant has a lot on its plate, and that it would be difficult to completely avoid slip-ups. However, this is just the latest in a string of incidents where Facebook has been overly aggressive with takedowns, only to backtrack after a public uproar. And this time, it can't pin the removal on ambiguities in its existing policy -- it acknowledged that the original image was fine in its mea culpa. Clearly, the company has yet to reach that point where it can reliably tell the difference between potentially offensive content and something that's merely testing boundaries.