The Google - Facebook dust-up:
An extensive write up at search engine land
. Good luck if you can make any sense of it.
As the social network companies continue to expand their pursuit of "relations" that pertain to you, they almost certainly will get to the level where their constructed network for an individual will extend to "six degrees of separation". In other words, whatever Kevin Bacon
likes may end up determining what ad appears on a webpage you visit. So what's the point?