@chabermaca as the parent of a 12yo girl, kids today (at least in the UK) would be utterly left behind without access to the internet. Unsupervised before they're about 8 is a bad idea, and having more than a passing knowledge of browser security is a huge benefit, but they can't be left without. Yes, you run the almost inevitable access to pornography. On the other hand, so long as they aren't looking for porn, stumbling on it is a part of modern life.
From age 11, if you don't want a weirdo shut-in of a child, a smartphone is an essential tool. I wouldn't have believed it if I hadn't seen it for myself, either. It is a totally normal thing to just call someone up and watch a movie together, but separate. Or, have a group call to help each other study, or catch up on school work. Or, just to invite someone into your room without them leaving theirs. Makes my own, shut-in childhood look rather more bleak than I thought it was already.