Updates to Google Social Search, that rolled out new improvements enable you to get even more information from people you are connected to. If they're publishing on Twitter, Flickr, Blogger or other publicly available sites, their results will appear in your results. When you sign in to your Google Account, you can get ideas and recommendations from people you trust, right in your search results. If unwanted results from spam showing up in your search results, you can use this chrome extension to fight those spam sites.
Official Google Blog: An update to Google Social Search