Renato Losio When a user uploads a picture, posts on Facebook or searches on-line for the nearest events, location-based services are part of the equation. They present unexpected challenges to the developer who targets an international audience but wants to rely on location data to control new features. When a controversial decoding is in a disputed territory or a partially recognized state, the corner cases might become a support and PR nightmare: what are the safest patterns and how do the four big platforms (Amazon, Google, Apple and Facebook) tackle issues related to geolocation? 35 participants