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PostSecret is one of the gems of the Internet. You anonymously write a secret on a postcard, and you can send it away for it to be published online.
But PostSecret is vehemently against SOPA and anti-piracy, and has also blocked out its site. It has made no comment on the matter, but did ask its users on Twitter whether it should. The consensus ruled in protests' favour. In a tweet, PostSecret announced the blackout.