Here is a video that overviews the Google+ social network. I am not sure why, but this video was among the most popular videos on Youtube when I posted it.
So, yeah, Google wants to take over the world. There's no surprise there ...
Personally, I think that the Google+ social network is lame. My experience with it has been somewhat negative so far. I signed up for an account, played with it for 10 minutes, and then never touched it again.