document: Propagation of trust and distrust A ( directed ) network of people connected by ratings or trust scores , and a model for propagating those trust scores , is a fundamental building block in many of today 's most successful e-commerce and recommendation systems . We develop a framework of trust propagation schemes , each of which may be appropriate in certain circumstances , and evaluate the schemes on a large trust network consisting of 800K trust scores expressed among 130K people . We show that a small number of expressed trusts\/distrust per individual allows us to predict trust between any two people in the system with high accuracy . Our work appears to be the first to incorporate distrust in a computational trust propagation setting .
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