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Monthly Frequency of Posts in Pages, by Category of Facebook Page, That (a) Do and (b) Do Not Contain a US State Name in the Title: October 2009–October 2019
Note. Vertical dashed lines correspond to the “Disneyland” measles outbreak (January 2015), the launch of Vaxxed (April 2016), and the onset of the 2019 measles epidemic (January 2019).
