If you are reading this on or near December 8th, chances are pretty good that you are a Google+ user since Blogger shares automatically to my G+ page. But if it's at least 24 hours past that, you probably stumbled across this post via some other social share, or by searching for info about Google+.
For the second group, this post is for you.
So, are you on Google+? Technically speaking, you probably are. But I suspect you are not using it yet. There's a lot of confusion around G+. People aren't quite sure why they need another social network. People think it's a graveyard, there's no one there.