You can take a glimpse on this video, to figure out what we are protesting today against:
http://wordpress.org/extend/plugins/stop-sopa-widget/screenshots/
It effects the whole internet, globally. And basically, every website owner.
It's not only about internet freedom, you will get cut off of informations, news, you won't know wth is going on in the world, except through strictly controlled media, and shaped and biased informations.
Just imagine this: No more Google, no more Facebook, no more Wikipedia, no Rapidshare, Megaupload, Fileserve, no Mediafire. Probably lots of people you know from here, will be imprisoned, and criminalized..