Google Social Search

Google are preparing to roll out social search accross their network.  Google Social Search is an experimental feature that helps you find relevant public web content from people in your social circle, when you're signed in to your Google Account. For example, search for [ restaurants ], and restaurant reviews by your friends and other contacts may appear more prominently in your results. Join the Social Search experiment at http://www.google.com/experimental

This could mean that companies who are active on the social networks are set to get a lot more traffic from Googel Search in the near future. 

Take a look at the video below to see how it works.