Abstract: A method of facilitating the construction, maintenance, and usage of social-trust networks is disclosed. The illustrative embodiment monitors the call processing details of communication events between users of a telecommunications system as the basis for estimating whether or not a relationship exists between the users that can be exploited in a social-trust network. This is possible because the call processing details of communication events between users is an excellent indicator of the nature of the relationship between users. For example, if Alice calls Brian three times a day on average, including nights, weekends, and holidays, and Brian answers Alice's calls quickly and returns her unanswered calls quickly, then it is reasonable to infer that Alice and Brian have a relationship that is substantial enough to be used in a social-trust network.