I am experimenting with Google+ and hoping that it will turn out to be a bit more discreet than Facebook. I think many of us struggle with the way that one can chance upon a Facebook discussion that is busy totally destroying a person's or an organisation's reputation. Or you read a comment by someone and you are pretty sure that they wouldn't have written that if they thought you would see it - but basically they forgot how many people get to see what happens on Facebook.
Google+ with its circles and limited publishing should be more discreet - but I suspect that it very much depends on the user. And, unfortunately, I think that many people are drawn by the freedom, interconnectedness (access to friends of friends of friends) and lack of accountability on Facebook.
You can find stats about Google+ at www.socialstatistics.com. So, if you believe it, the person with the most Google+ followers IS Mark Zuckerberg.
And two thirds of Google+'ers are male and one third female. Somehow, I think I ought to feel guilty about that ?!?