[Rob!]

I think what you have to bear in mind is that she's 16 and old enough (and, to put it bluntly, legal enough) to make her own decisions. I understand your concern but we live in a generation where social media and dating apps are the norm and at 16 she's seeing the world around her in a very different way to how she was 10 years ago. By all means have a chat with her, but do it in a way to make sure she knows what she's doing and make sure she's aware of some of the dangers. If you go in all guns blazing she's unlikely to respond very well.