-In collaboration with Facebook, along with a consortium of universities and public health officials, the [Delphi group]({{< relref "/" >}}) at [Carnegie Mellon University](https://www.cmu.edu/) conducts the COVID-19 Trends and Impact Survey to monitor the spread and impact of the COVID-19 pandemic in the United States. This survey is advertised through Facebook. It has run continuously since early April 2020, and about 50,000 people in the United States participate **every day**. Survey results are publicly available on our [CTIS Results Dashboard]({{< relref "covidcast/survey-results" >}}), [COVIDcast Map]({{< relref "covidcast" >}}), [COVIDcast Exporter]({{< relref "covidcast/export" >}}), and in our [COVIDcast API]({{< apiref "api/covidcast.html" >}}).
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