We're exposing ourselves too much on the internet.
Recently one of my students told me that he was using his mother's Facebook account. I was quite shocked because this (very savvy), child is only 9 years old. I have had to tell young children that Facebook and other sites which expose your persona are dangerous. In fact I think Facebook itself can be dangerous for adults too. It sounds fun and it can encourage friendships between mates but don't Joeusers think that we are exposing ourselves to people with ulterior motives. OK, so as an adult you take a chance and enjoy sharing your personal life with friends and family---but you're sharing with a world full of sneaks, paedophiles and information searchers. Ergo--you are exposing yourselves.
As adults, do what you think is right, but keep kids away from Facebook.