Exactly, the inherent problem is the creation of shadow profiles of non Facebook users. The most annoying part is the fact that they can make your friends snitch on you, just in case you're not using your real name
And they'll steal your phone number from your friends' phones and add it your account without your knowledge. Every once in a while I log in to FB and it will ask me if I want to share my phone number with them, with my number conveniently pre-entered in the input field. I never gave them my number.
