My dd is currently logged on to her MSN account but is away doing her homework so I've come upstairs to "sneak a little peek" at Mumsnet and see she has a message waiting. I see its from a boy she used to go to school with and who messages her virtually every day. Hes invited her to start an audio conversation but 'cos she's not here she hasn't responded so his next message is "fuck u". I am livid and really feel like telling his mum (she would be horrified) - am I overreacting?