"Google today announced that it has 135 million active users checking their Google+ streams each month"
I usually check mine accidentally, one every few weeks. I have an account and lots of circles that are populated, but I don't post on it or look at others posts unless someone points me to something which happens once every month or two.
They should have stats on the number of hits G+ gets vs. FB. I know many of you use G+, but you are in a bubble. It isn't as big as FB and won't be anytime soon.