Okay I'll try to clear things up about ACTA the Treaty being signed today by the European Union and Ireland which in many cases is related to this topic. First of all, it's not going to censor the Internet, it's just going to monitor your usage on it; where you go and what you do there. As long as you don't do anything questionable (like download copywritten material), you'll be fine. The ISP's will be the one's doing the monitoring not the U.S. Government or any other Government.
So until the U.S. Government creates laws that will be based off of ACTA like SOPA/PIPA or the OPEN Act, ACTA has no effect at all. As for YouTube and Google they don't enable piracy and they don't sell anything so they'll be safe. The situation with Megaupload/Megavideo that was mostly Anonymous's fault for provoking the U.S. Government into shutting down those websites by hacking into Government websites by the Pentagon and the White House.
ACTA is a treaty, not a law. It's powerless until a law is put into motion that supports it.
They didn't take down megaupload to get revenge on Anonymous. That doesn't even make sense. And besides, Anonymous didn't start doing all the government site attacks until after they shut it down.