Google is really missing the whole point of Facebook (Facebook tends to miss it too). It's not about whizzy features, it's about interacting with your friends. I don't use Google+ because few of my friends do. I really don't want to have Google+ OR Facebook finding new junk to stuff in front of me. I want to find out what my friends are up to. It's better than emailing stupid jokes around.
I suspect too many Google staffers are never leaving the Googleplex anymore.