In the video below Jack Vale presents how easy it is to learn about your personal life from social networks. Now, we all know that we have some public information out there, but we don't really think about it. "So what if I publicly posted my Happy Birthday greeting to my mother?", one may ask.
But when a complete strange comes to you and starts discussing your personal life (or what you perceive to be your personal life), you start to realize that maybe you have a little too much of your life open for the world to see.