We publish research articles in conferences and journals primarily in the field of computer science, but also in other fields including psychology, sociology, and medicine. See our publications page for a full list; see below for excerpts from recent articles.
English Wikipedia's Editor Decline
From The Rise and Decline of an Open Collaboration System: How Wikipedia's reaction to sudden popularity is causing its decline, Halfaker, A., Geiger R. S., Morgan J., and Riedl J., American Behavioral Scientist, 57 (5), 2013.
The Tag Genome
From The Tag Genome: Encoding Community Knowledge to Support Novel Interaction, Vig, J., Sen S., and Riedl J., ACM Transactions on Interactive Intelligent Systems (TiiS), 2 (3), 2012.
MovieLens is a web site that helps people find movies to watch. It has hundreds of thousands of registered users. We conduct online field experiments in MovieLens in the areas of automated content recommendation, recommendation interfaces, tagging-based recommenders and interfaces, member-maintained databases, and intelligent user interface design.
Find bike routes that match the way you ride. Share your cycling knowledge with the community. Cyclopath is a geowiki: an editable map where anyone can share notes about roads and trails, enter tags about special locations, and fix map problems - like missing trails. Hundreds of Twin Cities cyclists are already doing this, making Cyclopath the most comprehensive and up-to-date bicycle information resource in the world.
LensKit is an open source toolkit for building, researching, and studying recommender systems. Do you need a recommender for your next project? LensKit provides high-quality implementations of well-regarded collaborative filtering algorithms and is designed for integration into web applications and other similarly complex environments.