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Controversial Users demand Local Trust Metrics: an Experimental Study on Epinions.com Community
The document discusses an experimental study comparing local and global trust metrics on the Epinions.com review community. It finds that around 17,090 users (over 20%) on Epinions are considered controversial, having at least one person who disagrees with the majority view of them. Experiments show that local trust metrics like MoleTrust2 perform better than global metrics like eBay's at predicting distrust relationships for controversial users, though error rates remain higher for these users. Further experiments vary propagation horizons and evaluate coverage. The study concludes local metrics are generally better suited to online communities where opinions of individuals can vary significantly.
