The proper halachaicly thing to do is ask them if they want to talk about the coffee room on ywn and if they do you can ask them what name they post under, if that is to be something you will share with them including disclosing your identity. That you saw their open screen is no crime and it is a prelude to a conversation. If they want to be discrete that is not the place to do so. But that said, if they are not a friend of yours and you do not regularly have conversations, it is not your place to “confront” another person about his anonymous postings on the internet unless of course it is inflammatory and clearly it is the same person. So best wishes.
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