I fail to see the point of posts such as these. If you are using someone else's services and communicating without e2e encryption, you either do not care about being spied upon, or are willfully ignoring it. The problem isn't that G+ adds a small amount more detail on your life that you've already mostly surrendered to Google; it's that you (i.e., citizens and elected representatives) passed the Patriot Act, condone wiretapping, and are allowing corporations to mine your data in return for "free" services.
As an immigrant, I have little choice but to surrender much of this information anyway to stay "legal", but I don't think it's very different even for a citizen. Until most of the country is ready to act against the bigger invasions of privacy, staying away from Google+ citing "privacy reasons" sounds somewhat pointless.