https://thenextweb.com/corona/2020/04/20/facebook-built-a-map-that-tracks-covid-19-symptoms-by-county/

Mark Zuckerberg today revealed Facebook has teamed up with Carnegie Mellon University to help track the spread of potential COVID-19 cases around the world – even situations where there hasn’t been an explicit diagnosis.

The company today revealed an interactive map that tracks where people are experiencing symptoms from the novel coronavirus throughout the US, based on data from an ongoing survey the company is running with Carnegie Mellon. The map is granular enough to let you see an estimated percentage of people with COVID-19 symptoms down to the county level