I know that everyone wants to be witty and make an impact when they post about SOPA/PIPA/ACTA, and they mostly talk about the things they won't be able to watch or listen to, but it's much more serious than that.
You will be punished for any copyrighted you share, even if it's accidental (That means that all of those recording artist that got started by singing covers on youtube would have been in violation, Beiber. If you post a video of anything and there's a popular song in the background, censored. )
Fortune 500 companies, Big Pharma, and Hollywood would have the power to demand small start-up companies online be shut down or fined into