Systems and methods for providing reputation management

A system for reputation management comprising:

• a plurality of service providers, each service provider associated with a reputation value;
• a plurality of raters, each rater associated with a trustworthiness value;
• a ratings collection unit configured to receive ratings, each rating associated with a service provider from the plurality of service providers and a rater from the plurality of raters;
• a reputation management unit configured to calculate reputation values and trustworthiness values using a belief propagation algorithm.

A computer-implemented method embodied in a non-transitory medium for determining reputation values of sellers and trustworthiness values of buyers in a marketplace represented by a factor graph model, the model including a plurality of variable nodes and function nodes corresponding to the sellers and buyers, respectively, the variable nodes and function nodes linked by edges representing ratings of a seller provided by a buyer, comprising:

• receiving an additional rating associated with a first seller and a first buyer;
• updating an edge corresponding to the first seller and first buyer based on the additional rating and a priority factor, wherein the priority factor gives greater importance to more recent ratings
• calculating the reputation values of sellers and trustworthiness values of buyers using a belief propagation algorithm applied to the model;
• flagging buyers with a calculated trustworthiness value below a certain threshold.