In March 2010 we told you about Google Social Search, which gathered blog posts, images, Tweets, and other information your friends/family were posting and placed them at the bottom of search results. You can read the March 2010 article here: Google Launches Social Search.
Previously, if Google’s algorithm deemed information from friends/family useful for your search, it would appear near the bottom of results. Now that information will be mixed into search results, with annotations and notes from the original poster.
Back in March we urged you to get a jump on your competition by building your social circle in Google. If you did that, good job! If not then consider starting now.