Information can be a powerful thing

Check out this article:

Trolling Wrong number style

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.