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The immensity and variety of personal information (e.g., profile, photo, and microblog) on social sites require access control policies tailored to individuals' privacy needs. Today such policies are still mainly specified manually by ordinary users, which are usually coarse-grained, tedious, and error-prone. This paper presents the design, implementation, and evaluation of an automated access control policy specification tool, XACCESS, that helps non-expert users effectively specify who should have access to which part of their data. A comprehensive experimental evaluation is conducted over real social network and user study data to validate the efficacy of XACCESS.
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