It's Jimmy. I've got a lot of circles because people know me for different things. You might think of me as a professional skier, computer hacker, board game enthusiast, or one of a number of other things. Doesn't matter, if you know me, add me.
I have a large number of circles, but with the advent of Collections, I use those instead. Almost everything I post is to a collection; if you don't like posts like that, just unfollow that collection. Once in a blue moon I'll post something truly public, but that's rare. If I post something privately but not to a collection, it's probably been restricted to friends, family, or geographic area. The only non-public collection I have is my Politics Collection, which I curate membership of. While I enjoy a good political debate, I prefer to limit the debate to people who can do so rationally and calmly, and for professional reasons, I don't include coworkers.