Yep, the site is blocked by Websense as "Social Networking". Recently our websense filters completely blocked all of the web and then once that was fixed I believe they reinstated the twitter blocks on our accounts. Sad news, but that is definitely why I put it in google reader and set up text messaging... I can still touch the tweet world ;)
I remember my old employer blocked one of my sites I had made myself. that was also a sad day. if they block wtfnext, I'll definitely bring it up and ask for it back.