ISP blocked due to abuse?

Well, it seems today that I'm now unable to post anything over at the 4chan imageboards, otherwise I get this message:
"Posting from your ISP has been blocked due to abuse. [More Info]"
I can still browse the site, all the images and threads load fine, I just can't post. What gives? I've never posted spam or porn.

>>169
Technically not all of 4chan. We're on 4chan right now; it's just posting in the imageboards.
CURRENT STATUS:

Front page > UP
Boards > UP
Post images > UP
Static files > UP
Posting > DOWN
Rapidsearch > UP
Discussion > UP