Facebook’s New Social Graph Search Engine: "When Facebook decided to improve its search functionality last year, the team decided to bypass using a third party service and build its own search engine. The new crawler creates an in-memory reverse index to scale for a comprehensive search of its 28 million users.
Search results on Facebook are now sorted by an “approximation of social graph distance.” Your friends and people in your network are closer to you in the graph, and will be more likely to be relevant to you. This concept has been applied to search results within applications for groups and events as well. This social graph is aiming to provide a unique set of search results that is directly related to what your online relationships consist of, and largely makes sense considering the still somewhat private and removed way in which people can find each other and connect on Facebook."
Search results on Facebook are now sorted by an “approximation of social graph distance.” Your friends and people in your network are closer to you in the graph, and will be more likely to be relevant to you. This concept has been applied to search results within applications for groups and events as well. This social graph is aiming to provide a unique set of search results that is directly related to what your online relationships consist of, and largely makes sense considering the still somewhat private and removed way in which people can find each other and connect on Facebook."
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