I've noticed that whenever my friends join and I want to check where they are it doesn't exactly tell me. I mean, it says if they're in a game or if they're in a lobby, but not which lobby. The simple solution would be to message them ingame, but you can't message someone who isn't in the same lobby as you. So I think it would be nice to have the option to see in which lobby they are or just enable global messages (or both).