This is great. The circle groups and the group chat is awesome. But I'm wondering how many groups you'd be able to create (would there be a limit?) and how the

This is great. The circle groups and the group chat is awesome. But I'm wondering how many groups you'd be able to create (would there be a limit?) and how the center stage of group chat works? It said in demo that the person talking or the loudest would be center but what if 3+ people hit the same volume level, or if like tinychat, there are multiple people talking? Would love to get a reply from someone in Google+ beta.