Fake News and the Sleeper Effect in Social Media Posts: the Case of Perception of Safety in the Workplace.

Fake news and misinformation on social media platforms are two of the biggest problems of the last few years. Understanding the underlying mechanisms of memory is of fundamental importance to develop specific intervention programs. In this study, 324 white-collar workers viewed Facebook posts focused on coronavirus disease-2019 prevention norms in the workplace. In a within-participants design, we manipulated the message and the source to expose each participant to real news, real news presented by a discounting cue (sleeper effect condition), and fake news. The results show that participants were more susceptible to fake news during a 1-week delayed posttest following a memory recall process. Furthermore, they remembered the message easily, but not the source, which did not differ in the real-news conditions. We discuss the results, mentioning the sleeper effect and fake news theories.