I let my kids use the net and play online games on sites recommended by their school as well as the odd FB one as well as the arcade here, but I would never let them have a FB page just because there is so much crap advertised, not to mention dodgy sites they could click on downloading who knows what viruses on the computer. There just isn't a need for them to have it as they need to learn how to form RL social networks before they worry about online ones.