In April 2010, Facook announced three social plugins: Like, Activity and Recommendations plug ins, Open Graph Protocol, and Graph API.
Facebook “Liked By Your Friends” feature is now integrated into Bing organic search results. To see the integration at work, you have to be logged into your facebook account. When you search in Bing, depending on the search terms, you could see a new Liked By Your Friends section within your search results. In this, you will see links which have been “Liked” by your connections or friends on Facebook.