Good of them to do something with photos. But what i really wish they did was to turn the circle concept on it's heads.
Content should be put in circles instead of people. As an example I like to follow Linus Torvalds, but only for Linux related stuff - if they allowed linus to put his Linux content in Linux circles, and Diving stuff in Diving circles, and then allowed me to follow the content i like, then we could talk about managing information.
Pinterest is splitting it the right way, but are only focused on pictures. I want google+ to do it for content.