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. 2021 Feb 28;406(3):505–520. doi: 10.1007/s00423-021-02135-7

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Traditional and alternative metrics for measuring research output. The metrics used to evaluate the impact of social media activity are changing; in a, the traditional focus on citations and impact factor (IF; Journal Citation Reports ©Clarivate Analytics) is increasingly challenged by b alternative metrics, dubbed “altmetrics” for short (collected by various projects, including Altmetric, Plum Analytics, and ImpactStory), that collect views and mentions over a wide range of sources, including (but not limited to) peer reviews on faculty of 1000, citations on Wikipedia and in public policy documents, discussions on research blogs, mainstream media coverage, bookmarks on reference managers like Mendeley, and social networks such as Twitter. Reproduced with permission from Elsevier under the Creative Commons license from Søreide [3]