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.

Greekfag here.
ISP: HOL (not joking)

Wtf? The way things go It'll be easier to count which ISPs AIN'T blocked.
How long is this shit gonna last?