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.

Damn, what the hell. Alright, let's try and appeal over at IRC. For those of you that don't know, head over to http://www.rizon.net/, sign up for a free account, and then enter chat with a nick at #4chan. That's the channel.
We'll have to try and appeal to the mods and see what the hell is just going on. I don't believe the mods are online though, fucking americans.