Multiple kickstarter project announcements posted on facebook got more replies and responses than that of Google+. Noted: I have more friends on facebook than those linked via Google+ to my circles but the ratio was the same in responses. Guess why?
I have lots of friends at G+, but I almost never check out what they do. Guess, I'm kinda old-fashioned, but i do pro at LinkedIn, check stuff out at FB, and use Google as mail and chat client and their Webmaster features, almost never giving a darn about their Social stuff. I guess, there's lots of people like me out there.