135 Million Active Users = Logs in once a month...
I log in more than once a month by accident on my phone, I am do not consider myself an active user. Unfortunately, these numbers are still pretty terrible. I personally think its much better than Facebook, but all my friends are on Facebook and I'm not gonna switch unless everyone else does.
My friends, family, co-workers and bosses are on facebook, and that is why my facebook profile is immaculate.
Google wants me to be like that on Google+? Ain't nobody got time for that! (2 or more clean profiles to share non incriminating, non sexist jokes to). Google kicked me off from google+ because I was using a moniker, Virtualban, for the web activities, something that even if not 100% unique, is still mostly mine. Too bad for them. I won't be sharing 9gag un-orthodox posts that I might find funny and would not share on facebook. Google will still monitor my search habits, but won't get me to enter their 'circles'.
p.s. the reason for facebook is the same as why Chuck Norris uses softener for washing clothes: So he can blend in with normal people.