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. 2021 Feb 5;7(2):e26090. doi: 10.2196/26090

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©Shuai Zhang, Wenjing Pian, Feicheng Ma, Zhenni Ni, Yunmei Liu. Originally published in JMIR Public Health and Surveillance (http://publichealth.jmir.org), 05.02.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Public Health and Surveillance, is properly cited. The complete bibliographic information, a link to the original publication on http://publichealth.jmir.org, as well as this copyright and license information must be included.

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Number of sources of social media posts in each time segment. Different colored dots represent different sources, and their sizes represent the proportion of sources.