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.

Alright guys, I finally managed to catch a mod, here's what he had to say:

It would seem that there are several manual spammers who are bypassing the captcha in order to spam the site, coming from New Zealand. Thus the spam was placed to keep them out, and a fix will be in place by next when, allowing them to lift the ban.

I guess we'll have to wait.