An interesting summary of the GlobalWebIndex for Q2 2013. 

Some takeaways are:

Google+ is catching up with Facebook in numbers, but not in active usage. This makes sense as Google has a very different and less unpleasant agenda than FB that is all about search, not lock-in.  Google+ gets by far the largest number of visits, which is exactly what Google is aiming for.

Pinterest is still the fastest growing social media system. The report calls it a 'social network' but I think that is a slight mischaracterization that doesn't quite capture its distinctiveness - it's at least as much about interest sets rather than networks between people, with a focus on content and themes far more than on individual's connected with one another. Tumblr is not far behind.

The trend is towards increasing mobility, of course. As an aside, it is interesting that Microsoft recently redefined smartphones as PCs. Probably an unwise statement from the point of view of their shareholders as it reduces Windows PCs to a very small percentage of the total.