The map shows an estimated percentage of people with symptoms of COVID-19. These are not confirmed cases but rather data from people who self-report certain symptoms that are characteristic of COVID-19. Data are displayed based on counties or hospital referral regions, and the map can also display the same geographic distribution of flu symptoms.
According to the site, the map is not intended to be used for diagnostic or treatment purposes or to be used as guidance on any type of travel. Rather, the estimates are intended to help policymakers and health researchers to forecast potential COVID-19 outbreaks.
The surveys are conducted on a voluntary opt-in basis for Facebook users in the United States according to this article, and Facebook plans to expand the surveys for international use to report of global symptom prevalence. Although Facebook administers the surveys, the data are stored by the Delphi Research Group at Carnegie Mellon University in an initiative called COVIDcast. More information is available here and here.
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