Emil,
Yes, this is a problem for the legions on Face Book. Some advice to share: Have you ever seen the movie "Catch Me if YouCan" ?
True story about a guy named Frank Abagnale, Jr. He was recently here in Columbus, OH holding a seminar on private internet security. He said that he never imagined 40 years after his hi jinks - that stealing someone's personal identity would become easier than ever before. He flat out stated: If you have a FB account, he's already 98% there in stealing your identity. Face Book offers some cool stuff - but it comes at a price - hopefully you guys can remedy your situation. Best of luck -