Learn how Foursquare processes and validates massive amounts of movement data in this conference talk from Data Science Conference Europe 2023. Discover the sophisticated techniques used to differentiate between authentic and fraudulent data, along with the implementation of advanced algorithms for stop detection and venue attachment. Explore the inner workings of Foursquare's movement engine, which processes billions of daily GPS records worldwide to reconstruct detailed movement patterns of millions of users. Gain insights into the technical challenges and solutions involved in handling large-scale location data, quality assurance processes, and the practical applications of movement analytics in real-world scenarios.