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Today's online social networks (OSNs) do little to protect users' private information especially relationships between them. This paper presents PrivOSN, an online social network system designed to be more private than existing systems while keeping neutral performance, preserving existing services, and defending against kinds of attacks already known. In PrivOSN, users' relationships are kept locally and can't be seen by OSN providers. By subscribing, users can follow and set up relationship with others, and these are transparent to OSN providers, for better privacy.