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. 2020 Dec 14;22(12):e20653. doi: 10.2196/20653

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©André Grow, Daniela Perrotta, Emanuele Del Fava, Jorge Cimentada, Francesco Rampazzo, Sofia Gil-Clavel, Emilio Zagheni. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 14.12.2020.

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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Number of DAUs and MAUs between March 13 and August 12, 2020 across the 8 countries based on all ad sets. Numbers were standardized for each country by dividing the value for a given day by the average number of DAUs/MAUs over the entire observation period. Lines show 7-day moving averages. We collected DAU and MAU values every 6 hours, as these estimates can change within 1 day. We averaged these multiple observations to obtain 1 number per day. Data collection started between March 18 and April 4; no data was collected on April 11, April 12, and between August 3 and 6 due to technical issues. DAU: daily active Facebook user; MAU: monthly active Facebook user.