1. A network reputation system, being in conjunction with one or more estimator's social networks and one estimatee's reputation network, said system comprising: a credentials and exchange component that permits a user to generate credentials and exchange matching keys with those persons having a social relationship with said user; a reputation evaluation component that enables other users to make evaluations about an estimatee via the sharing of social network information; and a query and response component that receives a query from a person having a social relationship with said user for requesting an evaluation about said estimatee, and responds an associated evaluation result to the person having a social relationship with said user, via the sharing of social network information and the evaluations made by the other users about said estimatee.