Shared screens and a Mirror of Vr, in VR.
Shared screens would be nice to show eachother stuff, maybe like a button you could click to say: 'Share this screen with a friend?'
I was thinking it would also be cool if you could visit a friend who's playing a VR game, and viewing a mirror of what they're playing in their home.
Maybe even go as far, as to view their avatar also? (this is just a plus)