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Foursquare just highlighted an innovative use of their API, that alerts people to public health issues.
DontEat.at is a service which merges city health code records with the Foursquare API to warn people via text message, when they check into a restaurant that has recorded health code violations.
An excellent example of the power of APIs for mashing up data and providing real-time value that can even be used for the public good.
