Most (83%) Google+ users are inactive?

That's not really surprising, is it? In addition to being par for the course with just about everything, Google+ is particularly susceptible to inactive users for one reason: the invitation scheme. People's curiosity is naturally accentuated when something has a limited membership. It becomes something elite, and so naturally we want to find out what's so special about it. Then we get an invite, log on, and most of us find that it's nothing special (yet!) and log off.