I was unaware of that level of censorship at Facebook. Where are you trying to post it.

I believe FB blocks links to TPB. They actually changed my password and sent me an email saying that they thought my account had been compromised when I tried to do it once. However, as alanh said, a little redirection will work to post it.

Edit: Source: http://www.techdirt.com/articles/20090507/1152134782.shtml

Looking into it. That domain is not blocked. It is possible to post links to the root domain, just not deep links. It could be a bug or misconfiguration on their side. FB does a ping to posted links to grab the title, thumbnail, etc. That seems to be failing for deeplinks to TPB.

Well, a manual level if indirection would solve it — publish a web page with a little more than a link to the Pirate Bay page; and post a link to that page, on Facebook. If you use Simplenote’s published page feature or Dropbox’s public folder, this can take but a minute.

Post it on twitter, then post a link to your tweet on facebook.

take a try with this copy-paste-tool:

http://www.clicktoapp.com