I'm so glad it ended in a "happy" fashion, with your daughter just trying to "help" you out. I don't know how well you know the guy she chatted with but maybe the two of you (you and your daughter) could chat together with him and he could "meet" her as herself and let her know she wasn't "bad" just that it wasn't a good idea, kind of reinforce your message but so she has closure and doesn't think he was "bad" too just because children chatting online is a bad idea in general? That way the two of you could get across the message that she doesn't "know" him and had no way to tell anything about him since she hadn't ever talked to him before. Would be a good object lesson for her later/adult use of computers and the two of you might be able to teach her a bit on how to judge whether a person is "worthy" of chatting with.