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Social networks have sprung up and become a hot issue of current society. In spite of the fact that these networks provide users with a variety of attractive features, much to users' dismay, however, they are likely to expose users' private information (unintentionally). In this paper, the authors propose an approach which is intended for addressing the problem of collaboratively deciding privacy policies for, but not limited to, shared photos. Their proposed algorithm utilizes trust relations in social networks and combines it with the Condorcet preferential voting scheme. An optimization is developed to improve its efficiency.
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