SEOChat: Is Google Plus an Empty Hangout?
“Since these new users may be signing up for some other Google service, and might not be the least bit interested in Google+, this forced sign-up policy could be skewing the figures. While it’s possible, even easy, to delete your own Google+ profile by going to the accounts setting page, it’s likely that many users simply don’t bother doing this. Instead, they just forget the have a Google+ account, or simply ignore the social service completely. You might want to keep this in mind the next time you’re trying to decide how much time to spend on any particular social site networking for your company.” Analyze your audience, divvy time accordingly.