The problem is that kids have a hard time with self-control. Accessing a device that is loaded up with dopamine traps and not actually launching those programs is part of what creates anxiety. They know things are being said, and they can't handle being so close and not getting their fix. It's similar to addiction. It's better that they use computers that have specific programs. Interestingly, since most kids don't access their social networks on computers, they have a different view of their use cases.