I usually stick to calling people their screennames, until I've met them in real life or began to know them more outside the internet. Depends how catchy the names are too though! Like when I think of Rye/Jessica I would probably always call her Rye because it seems like a good real name The same with Zeldy, I always think of her as that.

Although some people who know me better online do call me by my real name it feels a bit strange, and Xandy feels the most normal to me these days. xD I recently met up with some online friends in person and when they phoned me they called me 'Xandy' on the phone, which was weird! But even when I write letters or emails to people I know well I end up signing as Xander even if they do know my name. XD

So yeah! If you have a neat catchy name I will probably just use that, and I prefer Xan-whatever to my real name anyway :P