“…Italy, Brazil, and Germany emerge as important countries of interest in the sample. The second-largest sample size, consisting of five studies (Bessi et al, 2016;Del Vicario et al, 2016;Zollo, 2019;Pierri et al, 2020;Salvi et al, 2021), comes from Italy, which is not surprising given the country's "pluralistic polarized" political and media systems (Hallin and Mancini, 2011) and its longstanding issues with social media, populist parties, and problematic information consumption (Rossi et al, 2021). Interestingly, half of the papers based on Italian samples also define polarization as echo chambers or selective exposure.…”