Abstract: Systems and methods for establishing and measuring trust relationships in a community of online users. In the systems and methods, indications of the trustworthiness of members of an online community, and/or other resources within or outside of the online community, can be obtained that are dependent not only upon the perceived trustworthiness of the respective online community members and/or other resources themselves, but also the perceived trustworthiness of others within the online community who have deemed those respective online community members and/or other resources as being trustworthy. Such indications of the trustworthiness of online community members and/or other resources are measurements that can be strengthened as the trustworthiness of others within the online community with whom trust relationships have been established increases. In this way, the usefulness of such indications of the trustworthiness of online community members and/or other resources can be enhanced.