AT&T blocking controversial site after DDoS attack: Reports
TechDirt, and others, report AT&T is blocking access to 4Chan, a controversial internet site known as being a place for internet pranksters to cavort (more on its Wikipedia page). Apparently, the move started after 4Chan launched some sort of DDoS attack against AT&T, a claim that can't be verified. If true, AT&T's stance would likely violate net neutrality mandates and could serve as additional provocation for the 4Chan tricksters to perform more pranks on the company.
Update 8:44 AM EST: Apparently, the site is back, but suffering its own DDoS attack from attention. Expect this story to continue over the next several days.
Update 10:31 AM EST: One of our commenters points to this post, where a network engineer points out they were trying to save 4chan from the mess. If the posts are to be believed, looks like AT&T was actually the good guy in this case.
[Originally posted July 27th at 7:14AM]

One inaccuracy I’d like to note, it wasn’t that 4chan was DDOSing AT&T.
http://www.merit.edu/mail.archives/nanog/msg19609.html
This is apparently the issue they were blocking in order to fix.