ABSTRACT

This paper focuses on how Brazilian politicians helped to spread disinformation about Covid-19 vaccines, discussing legitimation strategies and actors that played a significant role on Twitter and Facebook. Based on data gathered through CrowdTangle and Twitter API, we selected the 250 most shared/retweeted posts for each dataset (n=500) and examined if they contained disinformation, who posted it, and what strategy was used to legitimize this discourse. Our findings indicate that politicians and hyperpartisan accounts have a key influence in validating the Brazilian president’s populist discourse through rationalization (pseudo-science) and denunciation (against the vaccine). The political frame also plays an important role in disinformation messages.