Note: Aggregates for the API, map, and survey results page are shown for weighted countries only. Please find the complete list of weighted countries that are weighted by Facebook here.
Microdata files include both weighted and unweighted countries. For more information on how to gain access to the microdata go here.
The Global COVID-19 Trends and Impact Survey (CTIS) is subject to several crucial limitations, many of which are common to web surveys. Anyone using the data to make policy decisions or answer research questions should be aware of these limitations, as outlined here.