I found this article to be incredibly interesting both because if provides you with statistics of usage and as well shows numbers for Facebook and Google.  I can personally say I started a Google+ Page as soon as it opened up to people, but I rarely ever visit the site, if ever.  The numbers of the site are continually growing, but obviously people just don’t care enough to come back and have interactions.  Google+ does offer a few cool features that Facebook does not, but usage time is clearly head over heels on the side of Facebook.