[chuppo]

Facebooks private messages are censored. Here in the western world we can not message one another freely when using this Facebook, of which many think are some kind of nice private messaging system like email. Its not and never was. For example try to send a thepiratebay.org link to your friends as a private message. Who knows what more they censor, perhaps the really interesting bits to censor seem to you like they have been delivered, but facebook never actually shows it to your firend. You would never know.

Also, you cant send life-changing notifications through messages to all your friends, for example there is a cap I think on to message 30 people at once.