According to one of Google's own services, google+ is pretty much dead:
http://www.google.com/trends/viz?q=google+plus&graph=wee...
compare with fb:
http://www.google.com/trends/viz?q=facebook&graph=weekly...
edit: thank you downvoters for illustrating the bias on HN. A fake stats piece promoting google as #1 on the frontpage? This place is turning into /. but with more google employees. I'm out.