Google+ Now Second-Biggest Global Social Network?

Google+ now is the second-largest social network globally, behind Facebook, while YouTube is number three, according to Globalwebindex. Ignore for the moment whether Google+ is actually an identity service, or YouTube a video application.

Most would agree that Facebook users are more active than Google+ users, in all the ways that social network activity normally is measured. 

Some will argue that Google+ "usage" is largely passive because Google is using Google+ as an identity mechanism, not a full-fledged social network, so the ranking does not necessarily mean too much.

On the other hand, it would not be hard to argue that the overall trend is that the largest networks, with scale effects, are winning share at the expense of small social networks with less scale.