You do not need 100% accuracy. Easy data mining: "Religious center" is a top-level category. "Religious school" is a type of "School". "Marijuana Dispensary" i

You do not need 100% accuracy. Easy data mining: "Religious center" is a top-level category. "Religious school" is a type of "School". "Marijuana Dispensary" is a type of "Shop & Service". "Gay Bar" is a type of "Bar". More evolved: Find location patterns that correlate with known gay or religious people (for instance by cross-referencing data sources). https://developer.foursquare.com/docs/resources/categories https://developer.foursquare.com/docs/resources/categories