Health authorities emphasize the importance of "radical transparency" in communicating about future COVID-19 vaccines to counter conspiracy-based skepticism. While this resonates with research that highlights uncertainty as a major psychological predictor of conspiracy-related beliefs, no systematic evidence exists regarding the effectiveness of transparency as communication strategy. This study tests the effects of transparent communication about a COVID-19 vaccine using a pre-registered experiment fielded to large, representative samples of Americans and Danes (N > 6,800). The evidence confirms that positive but vague vaccine communication does not increase vaccine support but rather infuses attitudes with conspiracy-related beliefs. Against the hopes of authorities, however, there is little evidence that transparency alone can reduce vaccine skepticism, unless this transparency discloses a highly safe and effective vaccine. Additional analyses suggest that this reflects that vaccine skepticism is not grounded in psychological uncertainty but in deep distrust of authorities, which impedes the effectiveness of their communication.
"Fake news" are widely acknowledged as an important challenge for Western democracies. Yet, surprisingly little effort has been devoted to measuring the effects of various counter-strategies. We address this void by running a pre-registered field experiment analyzing the causal effects of popular fact-checking videos on both believing and sharing fake news among Twitter users (N = 1,600). We find that the videos improve truth discernment ability as measured by performance in a fake news quiz immediately after exposure. However, the videos have not reduced sharing links from verified "fake news" websites on Twitter in the weeks following the exposure. Indeed, we find no relationship between truth discernment ability and fake news sharing. These results imply that the development of effective interventions should be based on a nuanced view of the distinct psychological motivations of sharing and believing "fake news".
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