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. 2015 Jun 8;17(6):e140. doi: 10.2196/jmir.4476

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©David J McIver, Jared B Hawkins, Rumi Chunara, Arnaub K Chatterjee, Aman Bhandari, Timothy P Fitzgerald, Sachin H Jain, John S Brownstein. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 08.06.2015.

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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Proportion of statuses posted each day by user group. Y-axis begins at 10% to more clearly demonstrate differences between groups. All differences between groups were statistically significant (P<.001).