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We are experiencing the expanding use of location-based services such as AT&T TeleNav GPS Navigator and Intel's Thing Finder. Existing location-based services have collected a large amount of location data, which have great potential for statistical usage in applications like traffic flow analysis, infrastructure planning and advertisement dissemination. The key challenge is how to wisely use the data without violating each user's location privacy concerns. In this paper, we first identify adoi:10.1145/2542666 fatcat:s72scf4ohfhbpaxryugc45f3xy