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Global Effectiveness of Fact-Checking in Reducing Misinformation Beliefs (PNAS 2021)
webAuthor
Peter Suber
Credibility Rating
5/5
Gold(5)Gold standard. Rigorous peer review, high editorial standards, and strong institutional reputation.
Rating inherited from publication venue: PNAS
Relevant to AI safety discussions around AI-generated misinformation and content moderation; provides empirical grounding for fact-checking as a mitigation strategy, though the study predates LLM-scale misinformation concerns.
Metadata
Importance: 42/100journal articleprimary source
Summary
A multi-country randomized experiment across Argentina, Nigeria, South Africa, and the UK tested 22 fact-checks and found that fact-checking consistently and durably reduced false beliefs across all contexts. Effects persisted more than two weeks and showed surprisingly little cross-country variation, while exposure to misinformation alone had minimal belief impact.
Key Points
- •Fact-checks reduced false beliefs by at least 0.59 points on a 5-point scale; misinformation exposure alone raised false beliefs by less than 0.07 points.
- •Effects were durable, with most reductions in false belief still detectable more than 2 weeks after intervention.
- •Results were consistent across four culturally and politically diverse countries, suggesting fact-checking generalizes globally.
- •Study evaluated 22 distinct fact-checks including two tested across all four countries, providing robust cross-cultural evidence.
- •Findings support fact-checking as a scalable, evidence-based intervention relevant to election integrity, public health, and AI-generated misinformation.
Cited by 1 page
| Page | Type | Quality |
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| AI-Era Epistemic Infrastructure | Approach | 59.0 |
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# The global effectiveness of fact-checking: Evidence from simultaneous experiments in Argentina, Nigeria, South Africa, and the United Kingdom Authors: Ethan Porter, Thomas J. Wood Journal: Proceedings of the National Academy of Sciences Published: 2021-09-14 DOI: 10.1073/pnas.2104235118 ## Abstract Significance Little evidence exists on the global effectiveness, or lack thereof, of potential solutions to misinformation. We conducted simultaneous experiments in four countries to investigate the extent to which fact-checking can reduce false beliefs. Fact-checks reduced false beliefs in all countries, with most effects detectable more than 2 wk later and with surprisingly little variation by country. Our evidence underscores that fact-checking can serve as a pivotal tool in the fight against misinformation.
Resource ID:
0b9b5a721733767d | Stable ID: sid_3O0iYkPsBI