I have trouble believing that G+ outstrips Twitter when it comes to social sharing. I think there is likely something at play other than that which isn't captured by this analysis. For instance, Twitter doesn't auto load articles the way G+ and FB do, so perhaps there is a distinction to be made there. At any rate, if G+ was this successful, I think we can all agree Google wouldn't have killed / pivoted it, which means the data is suspect in some way.