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The popular meme sites I Can Has Cheezburger is one of many sites under the Cheezburger brand. Featuring LOLcats and other memes, it receives over 1.5 million pageviews per day, making it one of the most popular sites on the web.
But the Cheezburger chief executive Ben Huh came out against SOPA on Twitter, and many others, including Tucows, followed suit.
Tens, if not hundreds of millions of Firefox users will see this screen when they first boot up the popular web browser. The entire page is blacked out and the Firefox logo is redacted.
Mozilla, the open-source company behind the Firefox web browser, has been one of the staunchest opponents to SOPA in recent months, and is using its vast user base to spread the message about Internet censorship.
You can read Mozilla's comments here.
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.