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.

http://www.formspring.me/mrvacbob/q/1557313556 Also, I'm assuming this was your question >>240. Like I said, it takes some time, but eventually he gets around to things.