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.

>>588
UPDATE:
A mod told me they MAY unban us  in a future, but he doesn't knows when.
Our only hope is to wait and see what happens, so in a future they may unban us.
Moreover, looks like this ban was made because of some idiots who were spamming.