SOPA explicitly states that companies will be liable for everything their users post. Sites like Facebook, YouTube, Twitter, Reddit, Wikipedia, or any sites that allow user generated content CANNOT exist under these laws. Immediately after this bill is passed, you will see the media mafia (MPIAA, RIAA, etc) replacing websites like Wikipedia with commercialized encyclopedia software. Mainstream media outlets will not cover this bill because they are the ones lobbying for it.
If you want to know more - Google created a doc to read and inform - SOPA for Dummies.
WRITE YOUR CONGRESSMAN AND STOP THIS BILL FROM PASSING!
To help you do this stop by Fight the Wall or American Censorship and find out how to connect with your Representative!
Hat Tip Cats of Wildcat Woods.