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A social graph is a mapping of social relationships between individuals. It reflects the people and their interactions through various channels: family members, colleagues, classmates and so on. Currently, the social graph has become the core value of every social platform. The core profit model of most Web 2.0 applications is to obtain users and their data by providing free services to users and then to obtain advertising payment from companies targeting the users. Users' social behavior creates value for the platform, but the value will not be distributed to the users but the company.