I'm loving G+. Its really the social aspect of facebook combined with the tell the world aspect of twitter but with a lot more control over who sees what you are saying.
By the time G+ came along, I had all but left Facebook anyway, so now I'm rarely on it for sure. The most interesting part of G+ is how you can do groups without actually setting up groups. Just put everyone into a circle that is part of the group and when you need to tell the group something, just post a message for that circle only.