Okay, on the right side of the AdSense account main page is a summary of your site's health. The last item in the report is about "Google +". I never activated Google +, but the report suggests that I have -- all bars are showing, congratulations all around! What gives?
The report does not seem to be 100% accurate, or at least slow in getting things right. It took several weeks for it to tell me that I am fully optimized for revenue, even though I haven't changed anything from when the report first showed up and told me I was barely optimized for revenue. So take what it says with a grain of salt.