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.

Just use a proxy for now. I'm using one, seems to be working. Just lurk if you can't post. Didn't know so many Flipfags exist here. Suddenly wanna meet you bros.