[shmerl]

While commonly used, chat is just one feature there. There are many popular and closed chat services like Whatsapp for example which aren't connected to social networks. So I don't see why you focus on this problem in the context of Facebook. The problem is a problem in itself. I.e. "how to break the walls of walled garden instant messaging networks".

[forteller]

Yes, you are of course right about that. It might just be a sign of my age that I just mentioned Facebook as the bad guy in my post… :)