Google+ is Google's answer to Facebook. At the moment, it does not seem to be as busy as Facebook, but it is being advertized heavily. The Google Chrome browser took off far beyond what I expected, to become the web's number 1 browser, so maybe Google+ will eventually take off as well. For that reason, I have a presence there, both with a personal page and a special Just Six Days page for my books. But, at the moment, I am not frequenting there as often as I am at Facebook.
My Google+ profile is gplus.to/pftaylor61
My Google+ Just Six Days page is gplus.to/justsixdays