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.

So... should we talk with a mod at #4chan?
I tried creating an account at Rizon, but then it's hard as shit to enter the chat. It keeps telling me to register the username and, if I try that, it says password is incorrect...

Fuck it, I entered with Mibbit but there's no-one there... it's fuckin empty! Just me and a bot.

Forever alone.