Google +
Here's a video overview of Google + which is Google move into the social media space. They have tried a couple of times before unsuccessfully but regardless of their ability to execute a real social platform there is what I think a solid insight behind Google + which is the partitioning of different social groups by people and therefore social media reflecting that tendency. Eg there are conversations you want to be able to have with certain groups that you don’t want to have to broadcast to your entire network.