Web Of Trust
see esp MeatballWiki:WebOfTrust - In Collaborative Hypermedia, users are ideally given a large degree of freedom to add, edit, and remove content. Overly strict security mechanisms not only discourage free cooperation, but can fail to protect communities from malicious users. Systems like the Wiki Wiki Web "replace technical security with social and political limits" (Clifford Adams). The Web Of Trust concept attempts to create technical security that is based on the social strength of the community. An important part of the WebOfTrust (and what makes it different from a TrustMetric but the distinction is not always clear) is that it measures trust for each user based on his or her choices.
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