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. 2016 Jul 19;18(7):e191. doi: 10.2196/jmir.4480

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©Marcel Winandy, Patty Kostkova, Ed de Quincey, Connie St Louis, Martin Szomszor. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 19.07.2016.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), 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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Facebook: number of likes. Note: information was only gathered from mid-July onward. Phase I: set up; phase II: active promotion; phase III: last-minute promotion; phase IV: actual event; phase V: postevent.