We do have a naming issue concerning all kinds of contexts. Groups could be simple contexts without the elaborate features of places (occasionally also dubbed rooms or chatrooms), but in fact groups as such do not exist. You could have a barebones context, but nobody ever did that. What we do have are presence contexts of a person, which reaches out for the group of friends of that person. Then there are also channels, but they are just a special case of contexts. So whenever you feel oppressed by all of these terms, just think they all basically mean the same thing.