A collaborative study involving researchers from the University of Kent, Moonshot, Google Jigsaw, and the University of Cambridge has confirmed that short prebunking videos can effectively reduce susceptibility to online misinformation. Published in Communications Psychology, the research suggests these interventions help users identify manipulative tactics before they encounter them. The study was conducted in anticipation of the June 2024 European Parliament elections, where the partners launched the largest video prebunking campaign on YouTube to date, reaching 1.5 million users. Prebunking is an intervention strategy rooted in inoculation theory. It prepares individuals by exposing them to weakened versions of misleading arguments, thereby building resistance against future persuasion attempts. While previous academic work established prebunking as generally effective, assessing its real-world impact remains challenging due to difficulties in monitoring user attention and determining specific success factors. To address this, the team conducted a large-scale international survey across twelve European Union nations, including Belgium, France, Germany, and Spain. The survey, translated into 13 languages, involved 19,735 participants. These individuals were randomly assigned to either a control group, which watched highlights of Lionel Messi's football career, or one of three prebunking groups. Some samples also viewed a shorter 20-second version of the videos in addition to the standard 50-second clips. Following the video interventions, participants underwent a manipulation discernment test. They evaluated a series of statements, social media posts, and public communications, some containing tactics like scapegoating, discrediting, or decontextualization, and others containing no manipulation. The goal was to see if participants could detect manipulation without falsely labeling non-manipulative content as deceptive. The results indicated that prebunking videos successfully improved the ability of users to spot manipulative content. The study found that longer 50-second videos were more effective than shorter versions. Furthermore, the effectiveness of the intervention was influenced by the educational background of the participants. While the intervention worked consistently across the diverse European sample, the researchers observed that the impact was stronger in nations with higher GDP per capita, education indices, and democratic indices. Mikey Biddlestone, the first author of the paper, noted that this suggests structural support for knowledge and democratic freedom creates conditions necessary for prebunking to succeed, likely because individuals in these societies already possess stronger baseline critical thinking skills. The findings confirm that prebunking is a reliable tool for reducing the spread of misinformation across different cultural contexts. Looking ahead, the researchers aim to expand their work to include populations that are deeply radicalized or hold strong conspiracist worldviews. Biddlestone expressed interest in investigating whether prebunking can reach individuals who are resistant to corrective content because they view the intervention itself as part of a conspiracy. Future studies may explore methods to counteract such resistance, potentially refining prebunking strategies to protect more vulnerable demographics from online manipulation.