Table 1.

Search keywords used to collect and filter tweets for inclusion in the data set.

Category	Keywords
Coronavirus	covid, covid-19, covid19, ncov, sars-cov-2, sarscov2, 武汉肺炎, 武汉疫情, ncov2019, 2019ncov, ncov19, 19ncov, coronoravirus, wuhan virus, covid_19, coronavirususa, coronovirus, coronavid19, coronavirusupdate, coronaoutbreak, coronavirusaustralia, coronvirus, coronaalert, covid—19
Face mask (substring search)	mask, n95, cloth face, cloth cover, face cover, mouth cover, nose cover, cover your face, coveryourface