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Human computation is an effective way to channel human effort spent playing games to solving computational problems that are easy for humans but difficult for computers to automate. We propose Thumbs-Up, a new game for human computation with the purpose of playing to rank search result. Our experience from users shows that Thumbs-Up is not only fun to play, but produces more relevant rankings than both a major search engine and optimal rank aggregation using the well-known Kemeny rule.doi:10.1145/1526709.1526861 dblp:conf/www/DasdanDK09 fatcat:zkffo2nklfg53dvaroksaqqrh4