I feel Google's strategy is indecisive, thus leads to you and I's confusion about the tool's purpose. I feel G+ produces the features of a more private Facebook (by directly implementing Paul Adam's model that matches more closely to the real life social graph), but advocates the use of an advanced Twitter (by inviting famous folks in for people to follow) and effectively builds the social graph top-down rather than bottom-up as in Facebook's case.

Pundits have already speculated that social networks aren't supposed to grow top-down, and G+ will ultimately fail (http://www.techjournalsouth.com/2011/07/why-google-will-fail...). Then again Google has always detested doing something too manually, especially when it involves human beings.