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Data from CMU's Facebook-distributed survey. Feb 10 wasn't necessarily the high-water mark for mask use, just the earliest date on their online explorer. delphi.cmu.edu/covidcast/indicator/?sensor=fb-survey-smoothed_wwearing_mask_7d&date=20210210
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The second map shows that some people are capable of putting on masks in response to rising cases. The first map shows that most people will put on masks when there's both a mandate and a major wave of cases.


