up2date, I turned it on but soon found that 1. the web messenger would
cause native MSN to become offline; 2. the session is quite unstable
that history get lost easily. So I have to turn it off. Generally it
is for people who don't have their own pc but stay on LJ for very long
time, because of the MSN protocol restriction. LJ already has its own
jabber service, why not make a web jabber client instead? Or use web
gtalk, which has a lot of users too. Maybe LJ is just experimenting
them?