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Wikipedia's coverage of current events blurs the boundaries of what it means to be an encyclopedia. Drawing on Gieyrn's concept of "boundary work", this paper explores how Wikipedia's response to the 9/11 attacks expanded the role of the encyclopedia to include newswork, excluded content like the 9/11 Memorial Wiki that became problematic following this expansion, and legitimized these changes through the adoption of news-related policies and routines like promoting "In the News" content on thedoi:10.1145/2491055.2491062 dblp:conf/wikis/Keegan13 fatcat:iclgmk42x5ekdckc3bxzvbif7e