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We present Pythia, a privacy-enhanced noninvasive contextual suggestion system for tourists, with important architectural innovations. The system offers high quality personalized recommendations, non-invasive operation and protection of user privacy. A key feature of Pythia is the exploitation of the vast amounts of personal data generated by smartphones to automatically build user profiles, and make contextual suggestions to tourists. More precisely, the system utilizes (sensitive) personaldoi:10.1109/compsac.2015.88 dblp:conf/compsac/DrosatosEASA15 fatcat:3q7mj5qihjca3j67lqrr2nuiey