Since a single post would be hard to talk about it in detail I'll say this...
You use facebook? Don't expect it to stick around if the bill passes
Youtube? It has atleast 1 pirated song or video on it, so that's gone
Google, Yahoo, Bing? Links to sites with pirated content. That's gone
Imgshack and Photobucket? They have copyrighted pictures on it. Gone.
AIM, MSN, Yahoo, Skype? You can send links to piracy and send pirated files. No longer around.
http://americancensorship.org/If you live in the states, write to your rep or call them.
If you don't, then you can still join online petitions and possibly even urge your own government to pressure the U.S. government. This effects
every company around the world that uses the internet! If the U.S. deems your site to aid in piracy or hosting illegal/copyrighted content (forums, blogs, comment sections, instant messaging, LINKING) then the site can be blacklisted forever. Do something, or the internet will no longer push innovation.
(not posting this as a rep of the company)