Citation - Heverin, T., & Zach, L. (2010). Twitter for city police department information sharing. Proceedings of the American Society for Information Science and Technology.

Keyword - disaster informatics, information behavior, social meida, law_enforcement

• 背景/動機：
• 本文探討，美國大型都市(人口超過30萬)的警察單位如何使用 Twitter。
  In this paper, we examine the use of Twitter by city police departments in large U.S. cities (cities with populations greater than 300,000).
• 研究問題：哪一種資訊 市警部門會透過Twitter分享？ 公眾如何使用分享警察部門的資訊並與他人談論？
  The purpose of our study is to determine what types of information are shared by city police departments over Twitter and to determine how the public uses the information shared to converse with the police departments and with each other.
• 假定：n/a
• 方法/資料：
  • 閱讀並分析30所都市警察部門的4,915則Twiiter發言。
  • 分析結果顯示，美國大型都市的警察部門主要透過 Twitter 刊布犯罪與意外相關的資訊。警察部門同時使用 twitter 分享部門、活動、交通、安全提醒、犯罪預防等資訊。在最小程度上，警察部門使用twitter作為一種公共與新聞媒體。
    We read and analyzed 4,915 posts authored by 30 city police departments that have active Twitter accounts. The analysis shows that city police departments in large U.S. cities primarily use Twitter to disseminate crime and incident related information. City police departments also use Twitter to share information about their departments, events, traffic, safety awareness, and crime prevention. To a lesser extent, city police departments use Twitter to converse directly with the public and news media.
  • 我們同時抽樣了四周、總計包含了警察部門的twitter帳號名稱的 1984則公眾發文(tweets)，發現這些發文主要都是轉推(retweets)警方的發文。公眾發文也會在討論中提到警察部門，或是透過直接訊息與警察部門溝通。
    We also sampled four weeks of public-authored tweets, totaling 1,984 tweets, that contained police department Twitter usernames and found that a majority of these tweets were retweets of police authored tweets; public-authored tweets also mentioned police departments in discussions or were used to send direct messages.
• 發現：本論文加深了我們對都市警察部門對資訊分享，與公眾以社會媒體工具傳佈資訊的理解。
  This paper furthers our understanding of information sharing by city police departments as well as public redistribution of this information through the use of social media tools.

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