13. Reputation mechanisms Jensen, Davies & Farnham (2002) How much your friends like interacting with this person, on average Explicit peer-based How often this person interacts with one or more of your friends Implicit peer-based How well your activities and interests match up with those of this person Collaborative filtering How long and how much this person has participated in the community Rating systems How much community members like interacting with this person, on average Ranking systems