How could a social network build that kind of culture? I really like G+'s circles -- it's like email lists done right. But the posts still feel like Facebook, Twitter, or worse. Everybody seems to want to be heard, but not questioned. Funny link? Cool. Witty insight? Nice! Angry rant or whiny observation? OK, feel bad for you, but I doubt you want to talk about it on Facebook (nevermind that you just did). Conversation starter? ...haven't seen one of those in a while.
Hangouts are cool -- they force you to be more than passive. I should use those more, but the local bar seems to compete pretty strongly in that niche.
I guess I've got more important things to do that read G+ all day, but somehow I don't have more important things to do than check email all day or go out with my friends every night. I wonder if there's a technological solution (a better Wave?). I doubt it. I suspect it will have to be deliberately cultivated -- a social network that makes the REPLY button larger than everything else and prioritizes posts with between 2 and 10 responses. I don't have the faintest idea how to start building that sort of community.