Is Google+ Suffering from Weak Engagement?

When talking about Google+, the number to quote is usually 100 million users.  That’s what was announced as part of Google’s latest announcement and also seems to check out with web pundits based on the fact that Gmail has an estimated 60 million users and many of those are grandfathered in to the Google+ social network.  However, a recent analysis by RJMetrics is looking at just how active the users of Google+ are, and whether the social network is the equivalent of a special