The circle feature, while nice, makes it look like a ghost town.
I don't put people that are not on G+ in my circles so when they sign up, they see an empty feed. Facebook knows that you need a minimum amount of friends in order to find the service useful. With G+ and the circles, this threshold is higher and more difficult to reach as there are less users.
Search for topics that interest you... add those people to a circle.. voila - you have a bunch of people you can share things and discuss with. I have a circle of VC's & angels, a circle for Python enthusiasts, a circle of C#/.NET enthusiasts, etc. My stream is always full of new and interesting discussions.
I don't think G+ will be a "social network" like Facebook. And that's a good thing. There's a reason im not on Facebook but I still use Twitter and G+. A lot of the people I talk to feel the same way.
What's more interesting to you... A) Reading about your friend's drama issues or B) Reading about the latest, coolest startups and technologies?
