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.

There's nothing more we can do. I know it's painful to just read threads and not post in them but I'm not planning on getting on their bad side with excess inquiries. We can only wait it out.