Collaborative FilteringCollecting PreferencesFinding Similar UsersEuclidean Distance ScorePearson Correlation ScoreWhich Similarity Metric Should You Use?Ranking the CriticsRecommending ItemsMatching ProductsBuilding a del.icio.us Link RecommenderThe del.icio.us APIBuilding the DatasetRecommending Neighbors and LinksItem-Based FilteringBuilding the Item Comparison DatasetGetting RecommendationsUsing the MovieLens DatasetUser-Based or Item-Based Filtering?Exercises