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.

>>967
I know, happened like 3 times to me, works a week then a few months it doesn't, but now it hasn't worked for like... 6 months for me. Not being able to post is really a pain in the ass i mean i have no friends, talking to people on /b/ is the only way i can socialize and not become a mad sociopath who wants to murder everyone.