Adult video-sharing list leaked from law firm
The attacks were declared on notorious message-board 4chan and were reportedly in retaliation for anti-piracy efforts against file-sharing websites.
Users of 4chan are renowned for online activism and direct action. "Operation Payback", as it was known, was reportedly revenge for the MPAA and RIAA's action against The Pirate Bay.
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453rd rule of the internet: you shall not make 4chan angry.