I agree that legit piracy is wrong. But what this entails is that if I sing a kareoke of some song and put it on Youtube and the copyright holder doesn't approve they can not only take it down but charge me with a felony. Or say I am at a sporting event recording with my own camera and a copyrighted song is playing in the background and I upload that somewhere. Same thing. Or say I link to a site that has copyrighted material, even if I don't directly have any, I could be charged. Even if you are a citizen of another country they will seek to extradite you to the US to face charges. They are actually try that now on a british teenager under current laws but it's not illegal in the UK.
People like Grayson Chance and (as much as I hate to support his talentless butt) Justin Bieber would have been criminals under SOPA since they started on youtube covering other peoples songs.
Mike Mozart on youtube has a wonderful video on all this and says it much better than me and provides external references. I think his channel is Jeepers Media. I am at work so I can't check for sure.
Anyways, while I am for efforts to fight piracy, this isn't the way to do it.