To generate the survey-experimental dataset, we collaborated with an international survey company that interviewed representative population samples (i.e., age, gender, education) in six countries using equivalent methods (Belgium (Flanders): n = 1,063; France: n = 1,255; Germany: n = 1,019; Switzerland (German-speaking regions): n = 1,251; UK: n = 1,380; US: n = 1,038). The survey was in field from April 16 to May 6 2020.
To create the Facebook-content dataset, we accessed public Facebook data (posts and comments) through the Facebook Graph API using the Facepager application (Jünger & Keyling, 2013) from April 14 to June 21, 2020. We sampled the five most popular (reach and frequency of postings) alternative media outlets for each of the five countries, and for each analyzed the 70 most popular (number of reactions, likes, shares, comments) FB-posts, resulting in the following dataset of FB-posts (N = 1,661): France, n = 350; Germany, n = 350; Switzerland, n = 261*; UK, n = 350; US, n = 350.
*the outlets published less than 70 posts in that time period