COVID Symptom Survey

Delphi conducts a voluntary COVID-19 symptom survey, distributed daily via a partnership with Facebook. This survey asks respondents about COVID-like symptoms, their behavior (such as social distancing), mental health, and economic and health impacts they have experienced as a result of the pandemic. A high-level overview of the survey is posted on the COVIDcast website.

Aggregate data from this survey is available through the COVIDcast API as the fb-survey data source.

This documentation is for users who have a signed Data Use Agreement to receive individual response data from the survey. It describes the survey items, data coding, data distribution, and the survey weights computed by Facebook. If you are a researcher and would like to get access to the data, check Facebook’s page on obtaining data access, which sets out the basic conditions and provides a form to request access.