Not understanding why I got downvoted other than a lack of explanation.
A lot of easy "tech" work honestly consists of using google to find answers for people who refuse to use google for themselves. It never fails to amaze me. I was born knowing how to change the battery in a 2nd gen Prius keychain remote? LOL no I merely use a google search because you're too lazy to do it for yourself (or learned hopelessness where they're intentionally outsourcing the labor to me and I'm being the sucker)
I would imagine someone who's annual review consists of how well they've SEO'd their page will be enormously more interested in how well they're doing SEO than a kid writing an essay or a possible future customer, or really anyone else at all. Money is a powerful motivator.
I can pick 300 random real world friends and guarantee that 99% of them never use Google+, even the ones in tech. I have an account and in 1 year I have posted 2 things to an audience of practically no one.
Compared to other social metric's (facebook, twitter, etc), it's empty.
You can't just say that Google+ is not empty when it is so tied to your social structure. I have 3 friends on Google+ and 300 on Facebook. My Google+ is completely empty. Could well be the same for the OP.