If you create software, and you oppose SOPA, and you're on Twitter, please let @rupertmurdoch know. He writes, "So Obama has thrown in his lot with Silicon Valley paymasters who threaten all software creators with piracy, plain thievery" I'd prefer he not speak for me. Or anyone but himself.
It's funny, Rupert Murdoch voicing his opinion against something is pretty much an endorsement of it. He probably knows this, and the fact that he's said anything at all means he has given up support of these two bills.