From the Official Google Blog:
Your friends and contacts are a key part of your life online. Most people on the web today make social connections and publish web content in many different ways, including blogs, status updates and tweets. This translates to a public social web of content that has special relevance to each person. Unfortunately, that information isn’t always very easy to find in one simple place. That’s why today we’re rolling out a new experiment on Google Labs called Google Social Search that helps you find more relevant public content from your broader social circle. It should be available for everyone to try by the end of the day, so be sure to check back.
A lot of people write about New York, so if I do a search for [new york] on Google, my best friend’s New York blog probably isn’t going to show up on the first page of my results. Probably what I’ll find are some well-known and official sites. We’ve taken steps to improve the relevance of our search results with personalization, but today’s launch takes that one step further. With Social Search, Google finds relevant public content from your friends and contacts and highlights it for you at the bottom of your search results. When I do a simple query for [new york], Google Social Search includes my friend’s blog on the results page under the heading “Results from people in your social circle for New York.” I can also filter my results to see only content from my social circle by clicking “Show options” on the results page and clicking “Social.”