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Understanding better the volatility of tweets over time is important for validating the reliability of metrics based on Twitter data. We tracked a set of 37,918 original scholarly tweets mentioning COVID\u201019\u2010related research daily for 56\u2009days and captured the reasons for the changes in their availability over time. Results show that the proportion of unavailable tweets increased from 1.6 to 2.6% in the time window observed. Of the 1,323 tweets that became unavailable at some point in the period observed, 30.5% became available again afterwards. \u201cRevived\u201d tweets resulted mainly from the unprotecting, reactivating, or unsuspending of users' accounts. Our findings highlight the importance of noting this dynamic nature of Twitter data in altmetric research and testify to the challenges that this poses for the retrieval, processing, and interpretation of Twitter data about scientific papers.<\/jats:p>","DOI":"10.1002\/asi.24624","type":"journal-article","created":{"date-parts":[[2022,1,31]],"date-time":"2022-01-31T15:54:47Z","timestamp":1643644487000},"page":"1192-1195","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Facing the volatility of tweets in altmetric research"],"prefix":"10.1002","volume":"73","author":[{"ORCID":"http:\/\/orcid.org\/0000-0002-3802-2227","authenticated-orcid":false,"given":"Zhichao","family":"Fang","sequence":"first","affiliation":[{"name":"Centre for Science and Technology Studies (CWTS) Leiden University Leiden The Netherlands"}]},{"ORCID":"http:\/\/orcid.org\/0000-0003-2031-4616","authenticated-orcid":false,"given":"Jonathan","family":"Dudek","sequence":"additional","affiliation":[{"name":"Centre for Science and Technology Studies (CWTS) Leiden University Leiden The Netherlands"}]},{"ORCID":"http:\/\/orcid.org\/0000-0002-7465-6462","authenticated-orcid":false,"given":"Rodrigo","family":"Costas","sequence":"additional","affiliation":[{"name":"Centre for Science and Technology Studies (CWTS) Leiden University Leiden The Netherlands"},{"name":"DST\u2010NRF Centre of Excellence in Scientometrics and Science, Technology and Innovation Policy Stellenbosch University Stellenbosch South Africa"}]}],"member":"311","published-online":{"date-parts":[[2022,1,31]]},"reference":[{"key":"e_1_2_7_2_1","doi-asserted-by":"publisher","DOI":"10.1177\/0002764221989772"},{"key":"e_1_2_7_3_1","unstructured":"Cairns I. &Shetty P.(2020 July 16).Introducing a new and improved Twitter API. 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