XMPP is a fererating Chat system, SL started to die when Mesh came out and it stopped his open policy. If we want to revive SL, we need to urgently re-establish an open chat system. XMPP is the solution. It is open free and federating.
It would be nice to have a xmpp chat server that works inside and outside the SL.
Sometimes it is nice to keep in touch with residents even after logout.