A staggering malicious attempt has left facebook with “walls” filled with explicit pornographic photos over night. So far, staff has been hard at work cleaning up facebook accounts all over the web, but it seems they have their work cut out for them.

The images include hardcore porn, a dead dog, extreme violence and even Justin Bieber engaging in a (Photoshopped) sex act. ¬†Users are invited to click on the links, after which the event takes place on the wall of whoever clicks. The pornographic imagery didn’t appear on the walls of a browsing user itself, but in the news feed, posted by their friends. Of course, these friends had no idea of what’s going on and did not intentionally post the profanities.

It’s still not clear how the flood of images appeared and spread over a great deal of the network, however investigations are still in place. The number one suspect if Anonymous, which has an open adversity over facebook. The groups hasn’t taken credit for the act, though.

More likely is some sort of malicious link that users have clicked on unawares.

“It isn’t presently clear precisely how the offending content has been spread – whether users are falling for a clickjacking scheme, are being tagged in content without their knowledge, have poorly chosen privacy settings, have been tricked into installing malicious code, or have fallen victim to another vulnerability inside Facebook itself,” says Graham Cluley of security firm Sophos.

“It’s precisely this kind of problem which is likely to drive people away from the site. Facebook needs to get a handle on this problem quickly, and prevent it from happening on such a scale again.”

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