Google's Rapidly Spreading Dominance -- A Picture is Worth a Thousand Words
To more easily understand how rapidly Google's dominance is spreading throughout the web ecosystem, please look at this one-page-graphic called "Google's Rapidly Spreading Dominance." As the old adage says, a picture is worth a thousand words.
This graphic is highly instructive because it indicates that naysayers, who are writing off Google+ as a viable competitor to Facebook, are doing so prematurely.