Next: Introduction Item-based Collaborative Filtering Recommendation Algorithms Badrul Sarwar, George Karypis, Joseph Konstan, and John Riedl {sarwar, karypis, konstan, riedl}@cs.umn.edu GroupLens Research Group/Army HPC Research Center Department of Computer Science and Engineering University of Minnesota, Minneapolis, MN 55455 Copyright is held by the author/owner(s). WWW10, May 1-5, 2001, Hong