Facebook on Monday released its first map that tracks coronavirus symptoms county by county and plans to update it daily throughout the outbreak.

Facebook partnered with Carnegie Mellon University researchers to create an opt-in survey designed to help identify Covid-19 hotspots before the cases are confirmed. The map breaks down the percentage of people per county who have self-reported coronavirus symptoms, such as loss of smell, cough and fever.

It shows, for example, that 1.45% of people in New York County have reported coronavirus symptoms. But, as you can see in the map below, a huge portion of the map does not have enough participants to show data.

More than 1 million people responded to the survey within the first two weeks, according to Facebook. CEO Mark Zuckerberg said the company will roll out the survey globally this week, which will help it provide a more complete picture.