Speaking at TechCrunch Disrupt SF 2012, Zuckerberg talked about the possibility of developing a unique social search engine on Facebook. An engine that would take advantage of the enormous data pool filled with profiles, status updates, likes and shares to deliver truly customized results.
For example, say you’re looking for a new lunch hangout near work. You can Google it (or Bing it) and find out what’s nearby based on your location and you can get reviews from sites such as friendseat and citysearch.
What Facebook aims to do is personalize those results by telling you which lunch location is popular with your friends and co-workers. All the data is there, it’s just a question of building filters.