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Reddit has been one of the spearheads of the anti-SOPA and PIPA protesting movement. Through activism and lobbying pressure, the 35 million odd users on the site from all over the world have changed the political landscape, organised online boycotts and helped spread the word of the anti-piracy laws.
The user-curated news-sharing site will go dark from 8am--8pm in protest of the bills currently in Congress.
You can read Reddit's comments here.