redletterdave writes: Apple has purchased Spotsetter, a social search engine that uses big data to offer personalized recommendations for places to go. Spotsetter was designed to combine recommendations from friends with trusted reviews and other data to create more social maps. It would show you which friends were “experts” in a given area, and you could tag your friends as experts (like LinkedIn) to boost the influence of their recommendations. You could also discover new places by browsing Spotsetter’s maps to see where your friends have been and what they’ve recommended. Spotsetter’s app, which was available on iOS and Android, officially closed down just six days ago.