It's a very close call for me, because the small chance that a Wikipedia protest could prove the deciding factor against SOPA (which I think is doomed anyway) is weighed against the small chance that Wikipedia would be shut down by special interests, instead of facebook, youtube and other "much bigger infringers" on copyright.

I am against censorship, but at the same time, I am not sure it's a good idea to shut down the Wikipedia without any agreement on when it would go back up. Suppose SOPA passes anyway. Then what?