So normally I don't side with ISPs on issues like this, but in this case
AT&T did the right thing in blocking 4chan. 4chan was sending traffic specifically intended to disrupt some users' access to the rest of the network, so AT&T was perfectly justified in blocking them as it did.
Yeah, they could've communicated better about it. But the /b/tards were being, well, /b/tards, and earned their blocking fair and square.
-- Des