Annie my daughter is 14 and has had social networking, youtube, now answerbank and whatever else since she was about 11. Again she cites her age as higher than it is. I have absolutely NO WORRIES about her safety because she's an intelligent girl who understands the concept of social networking predators and is quite savvy enough to suss and deal with anything that comes up online. She also knows that she can come to her mother, me, her step father, her bothers, step sisters etc if there is a problem. Even if someone does make an inappropriate comment to one of the boys because they think they are older, it's really not a big deal, they just need to ignore it. They're growing up and need a little space and freedom imho in order to learn how to be safe and how to have fun in a way that doesn't jeopardise them. They seem to be doing this, so just support them in it and let them enjoy themselves.