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218 important. Second, since the volume of shared content is growing at an exponential rate, finding relevant information is becoming more difficult. Using insights from our measurement studies, we proposed using communities to address these growing dilemmas. Communities can aid in both access control (since they represent a natural middle ground between a user’s immediate friends and the rest of the world) and in information retrieval (since they often represent sets of users with shared interests). To demonstrate this approach in a deployed system, we presented the design, implementation, and deployment of PeerSpective, a system that uses a social network to provide better search results than socially- oblivious search engines like Google. A preliminary version of PeerSpective showed a 7% improvement in click-rate over existing Web search technologies, underscoring the potential of leveraging communities in social networks. 10.2 Future work So far, we have studied how users interact on today’s online social networks and ob- served how the trust and shared interest that links represent can be used to solve systems problems. The recent explosion in popularity of online social networks un- derscores the continuing integration of computing in our daily lives, a trend that provides a number of interesting research challenges. In the following paragraphs, we outline a few of these challenges. In this thesis, we have focused exclusively on the user graph of social networkingPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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