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One of the most compelling social questions, which until now were left unanswered by current technology, is "Who's that?" This question is usually asked about a new unfamiliar person in a social setting who piques one curiosity. This paper presents WhozThat, a system that ties together online social networks with mobile smartphones to answer this common and essential social question. WhozThat builds an infrastructure that shares social networking IDs locally, using wireless technology, while also leveraging a wireless connection to the Internet's social networks to bind identity with location.
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