Knowing who is experiencing symptoms and where could help health officials and governments to prepare for surges of hospital cases and decide where to allocate resources like ventilators, face masks, and personal protective equipment. Given the shortage of tests, and long delays for results, this map could be useful in helping to predict where COVID-19 hot spots are forming across the U.S. Obviously, the map is only as good as the data that's used to create it, and as you can see for yourself, vast swaths of the map don't have enough participants to yield reliable data. The map is part of Facebook's work with CMU and the CDC to predict the coronavirus's spread.
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