I always get e-mails about that stuff from this site:
http://demandprogress.org/
You can actually have your name read on the Senate floor during a filibuster if you go here:
http://stopcensorship.org/
Might be useful if you plan to run for office later, since you can point back to it as supporting freedoms yadda yadda, even before you were a Politician, yadda yadda.