Too Long; Didn't Read
Consider the level of cognitive development of children. For example, we don't let 4yr olds drive cars. Partially, because the brain develops certain spatial, motor, etc. reflexes over time. Just look at various psychological experiments with kids. They won't recognize for example that an object may still exist even if you don't see it. All of that takes time to develop. People aren't just born with that. Letting a child drive a car would be dangerous for both the child and the people on the road. Perhaps we can adopt that way of thinking towards other technologies like social media.