"I don't find Google+ all that innovative. It hits all the notes that a Facebook clone merits, and adds a few points of distinctiveness that are genuinely compelling -- but I don't find it all that interesting, personally. To my mind, Twitter was a far greater innovation that continues unchallenged. But before you judge me as harsh: Broad product innovation is not exactly what they were going for, I believe."
An ex-Googler's inside view on Google+ vs. Facebook