Apple is testing the waters of SoLoMo (social, local, mobile) with the recent acquisition of SpotSetter, a social search engine (and mobile application) that provides personalized recommendations about "places to go" by layering social data on top of maps.
SpotSetter is unique in that it sits at the intersection of social and local - something that Apple could certainly benefit from after dropping Google as its provider of Maps. The service combines a users' friends recommendations, reviews (see below), and various other signals in order to "reinvent" maps as a social experience.
The network pulls users' content from social networks including Facebook, Twitter, Instagram as well as venue content from 30 different review sites and other sources including Yelp, Google-owned Zagat, and TripAdvisor.