Well, there are some lessons here.
First of all, I tend to follow photographers and writers and artists on Google+. Women are well represented in those ranks. I do not get into the whole "resharing" of popular songs thing. There are Google+ users that do not engage; they share other posts or they share videos of songs they like. This really isn't engagement.
Second, Google+ is still in its infancy. A year ago, I wasn't on Google+. Now, I have over 3,800 followers and I've dropped Tumblr, Posterous, and, for all intents and purposes, Twitter.
It is too soon to beat the drum for the funeral march to begin; besides, sharing happens inside of circles. That sharing is not measured anywhere.