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More and more crisis managers, crisis communicators and laypeople use Twitter and other social media to provide or seek crisis information. In this paper, we focus on retrospective conversion of human-safety related data to crisis management knowledge. First, we study how Twitter data can be classified into the seven categories of the United Nations Development Program Security Model (i.e., Food, Health, Politics, Economic, Personal, Community, and Environment). We conclude that these topicdoi:10.1145/2537734.2537740 dblp:conf/adcs/KreinerIS13 fatcat:sm7eanacmvbglbsaj7ehnzukwq