With over one billion people connected to Facebook, we have to assume that many of them are criminals. (Criminals are people with friends too!) But the criminals we need to be concerned about are the ones who create all kinds of scams designed to do everything from getting us to open our wallets to clicking links so we enter our personal information that lets them infect our devices.
http://robertsiciliano.com/blog/2013/11/19/hackproof-your-facebook-account/