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. 2022 Oct 21;24(10):e39218. doi: 10.2196/39218

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©Samerchit Pithpornchaiyakul, Supawadee Naorungroj, Kittiwara Pupong, Jaranya Hunsrisakhun. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 21.10.2022.

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 https://www.jmir.org/, as well as this copyright and license information must be included.

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Examples of user interfaces of the Facebook Messenger–based (A) 21-Day FunDee and (B) 30-Day FunDee including 3 essential elements: greeting; content; and summary containing games, infographics, videos, and friendly conversations.