Now, several sites have been contacted by an AT&T rep who has said that while AT&T's terms of service allow them to do this, they won't -- they'll only cut you off if you're looking at child porn or advocating race-violence.
If AT&T sincerely doesn't ever intend on cutting you off for criticizing them, they can amend their terms of service to say exactly that. It's not as though the legalese came off a mountain on two stone tablets and changing them counts as blasphemy.
AT&T's representatives can issue statements that say that they'll only cut you off if you turn out to be Josef Mengele, blogging from behind your secret identity in the Argentine campos, but unless they actually put it in writing, it means exactly squat. They wouldn't get you to "agree" to their Terms of Service if they didn't envision a time when they might use them. Link
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.