Check out this article:
Information, even something as simple as a phone number on Facebook, is a very powerful thing. What gets put on the internet stays there and can potentially be used against you.
Here's another article:
How Social Media Networks Facilitate Identity Theft and Fraud - by Kent Lewis - Entrepreneurs' Organization
Social networks are a powerful tool that we use on a day to day basis. Misuse can cause significant harm not only to yourself, but also to your family and friends.
Be careful what you're putting online.