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We find that the day after a team loses, their fans decrease their contributions towards football-related pages (relative to after a win). Relative decreases are bigger if losses are unexpected, or if losing margins are big. In contrast, unexpected wins do not cause more contributions relative to wins that were not unexpected. Neither do big wins result in more contributions relative to small wins. Additionally, contributions to non-football-related pages are not affected by NFL game results. Our findings add to the literatures on (i) the determinants of individual contributions to peer production communities, (ii) how community dynamics affect user contributions, (iii) the importance of emotions, (iv) the effect of offline events on online behavior, and (v) the applicability of behavioral economics concepts to the HCI literature.<\/jats:p>","DOI":"10.1145\/3134701","type":"journal-article","created":{"date-parts":[[2017,12,6]],"date-time":"2017-12-06T21:23:15Z","timestamp":1512595395000},"page":"1-21","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["The Effect of Emotional Cues from the NFL on Wikipedia Contributions"],"prefix":"10.1145","volume":"1","author":[{"given":"Weiwen","family":"Leung","sequence":"first","affiliation":[{"name":"University of Minnesota, Minneapolis, MN, USA"}]},{"given":"Haiyi","family":"Zhu","sequence":"additional","affiliation":[{"name":"University of Minnesota, Minneapolis, MN, USA"}]},{"given":"Joseph A.","family":"Konstan","sequence":"additional","affiliation":[{"name":"University of Minnesota, Minneapolis, MN, USA"}]}],"member":"320","published-online":{"date-parts":[[2017,12,6]]},"reference":[{"key":"e_1_2_1_1_1","volume-title":"Consumers' identification and beyond: Attraction, reverence, and escapism in the evaluation of films. 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