I'm a guy, and a really good friend of mine is through Xbox. She's a girl, and when I panicked and didn't know what to say (I'm normally ok with all girls in public) I would start talking about music. We both have a huge passion for music, and if you want to talk to girls online just find something they like then talk about it. Also, me and my friends somehow came up with the name L'Daquan for her. You could also do things like that.