GroupLens

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CollaborativeFiltering system developed at the University of Minnesota. Trialed in a number of venues, including UseNet in the mid 1990s, though these are now largely defunct. Core of the [MovieLens] movie rating/recommendation system.

See: http://www.cs.umn.edu/Research/GroupLens/

FYI, GroupLens is also the name of the research group (as linked to above), and in that capacity is alive and well.

GroupLens

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