I'd add Coworkers, Drinking Buddies, Biking buddies, Dev buddies, ... this really has potential. I don't want to share holiday photos of my girlfriend in a biki

I'd add Coworkers, Drinking Buddies, Biking buddies, Dev buddies, ... this really has potential. I don't want to share holiday photos of my girlfriend in a bikini with developers I've never met but that are in my gmail contacts. Similarly I don't want to share geeky code stuff with people I met through my girlfriend. That example only involves two out of the dozen "circles" in my life.