How useful is Google+ for a small online business?

I have a Google+ account. Apparently everyone with a Google account has one. I never use mine and was curious to find out if anyone had ever used theirs to the benefit of their business. And so, I set out on a quest to find someone who could show they’d benefited from it, and explain how. I saddled up my Internet pony and trotted off to my usual haunts (some of them are behind paywalls) to see what people would say about it. I was asking a simple question.

Have you used G+ to benefit your online business?

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