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.

>>240
but the guy didn't even bothered to answer it.
Are any of you trying to browse the site from a mobile phone? This might explain why. http://www.formspring.me/mrvacbob/q/1557319111

If not a mobile phone, then your ISP must fall under that IP range (or some others, since there are a couple other IP range bans on at the moment).