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. 2020 Aug 28;22(8):e19629. doi: 10.2196/19629

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©Monika Pobiruchin, Richard Zowalla, Martin Wiesner. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 28.08.2020.

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 the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Cumulative depiction of all tweets in European countries between February 9 and April 11, 2020. Each red dot denotes one tweet. Tweets with the same geographical information are plotted on top of each other. *No tweets were collected between February 20, 2020, and February 22, 2020, and between March 28, 2020, and March 29, 2020, due to technical issues.