To date, the available literature mainly discusses Twitter activity patterns\ud in the context of individual case studies, while comparative\ud research on a large number of communicative events and their\ud dynamics and patterns is missing. By conducting a comparative\ud study of more than 40 different cases (covering topics such as elections,\ud natural disasters, corporate crises, and televised events) we\ud identify a number of distinct types of discussion that can be observed\ud on Twitter. Drawing on a range of communicative metrics, we show\ud that thematic and contextual factors influence the usage of different\ud communicative tools available to Twitter users, such as original\ud tweets, @replies, retweets, and URLs. Based on this first analysis of the\ud overall metrics of Twitter discussions, we also demonstrate stable patterns\ud in the use of Twitter in the context of major topics and events
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