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 got a mobile internet for Xmas, but I can't post on 4chan, it says the ISP is blocked, tho I can lurk just fine. Wtf? Mobile internets are blocked?

My IPS is Telenor