That children are tech-savvy these days,there is no doubt about it.
Why, even my children who are in early grades have an account (one account for both of them) in a popular social networking site. They use it primarily to play the games there.
When children are doing these, parents should be nearby to supervise their accounts. It is unwise to let them do unsupervised online activities using a laptop computer.
Even if parents lecture about not divulging private information like home addresses, email addresses and phone numbers, still parental guidance is recommended (yes, I sound like a tv ad but this is very important).
Oh wait, before I forget, even parents or adults need some supervision too when it comes to supervising their privacy settings in these SNS.
Have you checked your privacy settings lately?