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This study offers empirical insights into the development of rumors after they are debunked, the various user groups who are involved in the process, and their network structures. As crisis situations are highly sensitive to the spread of rumors, Twitter posts from during the 2017 G20 summit are examined. Tweets regarding five rumors that were debunked during this event were manually coded into the following categories: rumor, debunking message, uncertainty about rumor, uncertainty about debunking message, and others. Our findings show that rumors which are debunked early and vehemently by official sources are the most likely to be stopped. When individuals participate in the process, they typically do so by sharing uncommented media content, as opposed to contributing user-generated content. Depending on the conditions in which a rumor arises, different network structures can be found. Since some rumors are easier for individuals to verify than others, our results have implications for the priorities of journalists and official sources.<\/jats:p>","DOI":"10.1177\/2053951720980127","type":"journal-article","created":{"date-parts":[[2020,12,29]],"date-time":"2020-12-29T10:28:46Z","timestamp":1609237726000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":30,"title":["Caution: Rumors ahead\u2014A case study on the debunking of false information on Twitter"],"prefix":"10.1177","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0905-4932","authenticated-orcid":false,"given":"Anna-Katharina","family":"Jung","sequence":"first","affiliation":[{"name":"Department of Computer Science and Applied Cognitive Science, University of Duisburg-Essen, Duisburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2717-3705","authenticated-orcid":false,"given":"Bj\u00f6rn","family":"Ross","sequence":"additional","affiliation":[{"name":"School of Informatics, The University of Edinburgh, Edinburgh, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefan","family":"Stieglitz","sequence":"additional","affiliation":[{"name":"Department of Computer Science and Applied Cognitive Science, University of Duisburg-Essen, Duisburg, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2020,12,29]]},"reference":[{"key":"bibr1-2053951720980127","doi-asserted-by":"publisher","DOI":"10.2197\/ipsjjip.23.31"},{"issue":"1","key":"bibr2-2053951720980127","first-page":"53","volume":"4","author":"Al-Mansour A","year":"2014","journal-title":"International Journal of Digital Information and Wireless Communications"},{"key":"bibr3-2053951720980127","doi-asserted-by":"publisher","DOI":"10.1257\/jep.31.2.211"},{"key":"bibr4-2053951720980127","doi-asserted-by":"crossref","unstructured":"Andrews CA, Fichet ES, Ding Y, et\u00a0al. 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