. 2020 Jun 5;22(6):e17554. doi: 10.2196/17554
©Cornelia Pechmann, Connor Phillips, Douglas Calder, Judith J. Prochaska. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 05.06.2020.
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Figure 15.
Mean costs per query for Facebook advertising campaigns before versus after privacy scandal.