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On today's online social networks (OSNs), users need to reveal their content and their sharing patterns to a central provider. Though there are proposals for decentralized OSNs to protect user privacy, they have paid scant attention to optimizing the cost borne by users or hiding their sharing patterns. In this paper, we present Hermes, a decentralized OSN architecture, designed explicitly with the goal of hiding sharing patterns while minimizing users' costs. In doing so, Hermes tackles threedoi:10.1007/978-3-319-28865-9_13 fatcat:y5ckavzncbegjivgubjgio7yvu