> "Google+ really was on to something with its circles:... I could use google +, but no one else does"

I wonder how much of Google+'s 'use' problem relates to this feature working extremely well.

You section off people you like to keep in contact with, just not on a daily basis. You then don't send most of your day-to-day posts their way. They look at Google+ and see a wasteland.

And whenever they mention Google+, you can't just say "I love it and use it daily; I just put you in the 'Siberia' circle". The only answer is "I don't use it much." Which re-affirms their view of the service as being basically empty.