I know we talk a lot about privacy here and Google's requirement to use your real name. When seeing people's names and the network effects of events like this, it gets a bit unsettling. At least with Facebook, social networks and groups are relatively closed.
Update: Imagine the ability for a govt/group/organization to constrict the information flow by eliminating the strongest nodes in the sharing structure.
At least with Facebook, social networks and groups are relatively closed.
I'm no Facebook expert, but I believe that Facebook also has the three ingredients necessary to do this: 1) the ability to make public posts, 2) the concept of sharing posts, and 3) attribution of who the post came from when you share it.
It's not like this Google+ visualization is about private posts. The following page clearly says it is limited to those that are public.
Update: Imagine the ability for a govt/group/organization to constrict the information flow by eliminating the strongest nodes in the sharing structure.