This May 1, 2008 BBC News video is short, clear, and informative for both current Facebook members and consumers considering Facebook. I strongly recommend that you view the BBC video. Be an informed user of social networking sites.
You may also find these prior I've Been Mugged posts helpful:
You may also want to browse this MoveOn petition.
If all of the above has scared the daylights out of you, then you might want to view this YouTube video: