Google Plus has just hit a milestone for the service. Currently over 400 million people have upgraded to Google Plus. That is a pretty huge number. The next number might surprise you though, Google is now reporting 100 million active users of Google Plus, either via the web or the mobile application. We were a bit surprised that only 1/4 of people who have snagged Google Plus are actually active. We would have thought a little closer to half. Still, good news for us, Google and all you plusers out there. If you have friends that have a G+ account, encourage them to start using it and lets build that number up a little more.
Source: Vic Gundotra G+