"Google+ Statistics currently tracks and generates detailed statistics for 40,999 users and pulls in hundreds of the most popular posts, every second of the day, from Google+. Add yourself (see sidebar) so we can start tracking your personal Google+ statistics too. You will be able to see how many people added you to their circles, how you grow over time and where you rank in the list of popular Google+ users."
"We've collected A LOT of data. So much so, that we think we have a pretty good picture of what the Google+ userbase looks like.
Below, you will find data sets broken by Gender, Geography, Workpalce and as well as unique views such as Facebook employees vs. Google employees and so on.
Based on a sampling of 4,412,227 Google+ users, here are the trends:"