For those of you who do think that SOPA will not be abused, let me share a story. Last year near November I believe the popular site Megaupload was taken down for a day. For those who don't know Megaupload is a site where users can upload any kind of document, video, and whatever else you want to share with the world. When it was taken down singers such as P. Diddy, Kanye West, and Chris Brown branded together and created a song called the Mega Song and can be viewed here,
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Universal Music Group pulled the video claiming that the singers were violating their copyright contracts. They didn't. YouTube later reposted the video and UMG said that they could take down videos from YouTube because of some agreements they had made a few years together.
With even stricter laws on internet censorships what could other corporations do? What could movie and music corporations do if you upload something that they disagree with? You can find a link on the youtube page for more on the story.