I have just found out my 15 year old daughter has been messaging a 23 year old man. I was getting her friend's parent's number off her phone with her permission, and a message came up on the screen. I didn't recognise the name so I clicked on the message and seen that they had been flirting quite a bit, nothing overly sexual, but I'm still rather uncomfortable with this. I had a look and there was no reference to her age in their conversation. I know his age because of his birthday on his Facebook page. As far as I can make out, they meet at a party on the beach that she attended with her friends. My daughter could very easily get away with 17/18 years old. What do I do?