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I honestly haven't touched mine pretty much since I registered. I still think they shot themselves in the foot by making it invite only, because sure, you can get a lot of people to sign up for your nifty new social network, but if they can't get their friends to do it too then what's the point? No one wants to fumble around with invites; they just want to make an account and use the service.
By the time they opened up, it was too late; they lost their momentum, and everyone else lost interest. Also, "Google+" is a stupid and clumsy name.