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Instead, we introduce a scalable intervention to put factual and verified public affairs information in users\u2019 social media feeds to make them better informed and more resilient to various online threats. We conducted 48 field quasi-experiments using Instagram ads targeting news non-users to enhance their belief accuracy, democratic attitudes, and behavioral intentions related to climate change, COVID-19 vaccines, media literacy, and election integrity. The treatment videos reached 2,496,878 Instagram accounts, 690,470 users watched at least 50% of the video, and 40,584 of those users completed post-test assessment. The intervention was effective: 46 out of 48 of the quasi-experiments had positive effect sizes and 40 out of 48 achieved statistical significance. The intervention predicted not only belief accuracy but also attitudes, media literacy, and \u2014 to some extent \u2014 behavioral intentions related to vaccination. These patterns emerged across topics, did not dissipate with time (two of three climate change quasi-experiments show continued effects), and were not contingent on persuasive appeals and format features presented in the ads.<\/jats:p>","DOI":"10.1371\/journal.pone.0352588","type":"journal-article","created":{"date-parts":[[2026,6,29]],"date-time":"2026-06-29T17:32:48Z","timestamp":1782754368000},"page":"e0352588","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":0,"title":["Ad-based social media interventions increase belief accuracy and generate pro-social opinions among non-news 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