I've done this frequently, both with a friend on the sofa opposite mine, and with a friend in another room in the house. The stupidest conversation ever was about whether we wanted to get up and walk the ten metres to put the kettle on, or whether we could wait to have tea and coffee for a while longer, which descended into the chaos of when are they going to invent a kettle that you can IM to and will put itself on to boil!