Facebook even censors pirate bay links within private messages between you and friends iirc. They don't block select other torrent sites though. They're a bit odd like that.
Looks like FB blocks links to torrent detail pages on TPB.
Best I could do was post a link to things tagged with JSTOR (there's only one):
http://thepiratebay.org/tag/JSTOR
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.
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.
URL shorteners don't help.