The efficacy of Facebook’s vaccine misinformation policies and architecture during the COVID-19 pandemic
Open accessAbstract
Online misinformation promotes distrust in science, undermines public health, and may drive civil unrest. During the coronavirus disease 2019 pandemic, Facebook—the world’s largest social media company—began to remove vaccine misinformation as a matter of policy. We evaluated the efficacy of these policies using a comparative interrupted time-series design. We found that Facebook removed some antivaccine content, but we did not observe decreases in overall engagement with antivaccine content. Provaccine content was also removed, and antivaccine content became more misinformative, more politically polarized, and more likely to be seen in users’ newsfeeds. We explain these findings as a consequence of Facebook’s system architecture, which provides substantial flexibility to motivated users who wish to disseminate misinformation through multiple channels. Facebook’s architecture may therefore afford antivaccine content producers several means to circumvent the intent of misinformation removal policies.
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What makes misinformation consumers special is not privileged access to misinformation but traits that make them more likely to seek out misinformation, such as having low trust in institutions or being strong partisans.
“What makes misinformation consumers special is not that they have privileged access to misinformation but traits that make them more likely to seek out misinformation (Broniatowski et al., 2023; Motta et al., 2023), such as having low trust in institutions or being strong partisans (Osmundsen et al., 2021).”
From Misinformation reloaded? Fears about the impact of generative AI on misinformation are overblown (2023) · cites this paper as Broniatowski et al., 2023
The Results section, “Motivated users may still seek out misinformation” (page unavailable), reports that removals may not have dissuaded audiences from seeking antivaccine misinformation; its model suggests demand shifted to remaining pages and groups. This supports the role of motivation, but the paper does not establish that misinformation consumers differ from others because of their traits rather than privileged access. The examples of low institutional trust and strong partisanship are attached to a different citation in the citing sentence. (LLM, conf=0.82)
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Zhong, W., & Zhang, M. M. (2025) · Perspectives on Politics · doi:10.1017/s1537592725101941 · Cited by 2 · see citing works
Fujimoto, K., Tanaka, Y., & Inuzuka, M. (2025) · Health Communication · doi:10.1080/10410236.2025.2507676 · Cited by 1 · see citing works
“Despite various efforts to curb the spread of misinformation on social media platforms (e.g., Broniatowski et al., 2023; Cotter et al., 2022; Warnke et al., 2024), misinformation on COVID-19 continues to spread.”
Perceived legitimacy of layperson and expert content moderators
Martel, C., Berinsky, A. J., Rand, D. G., Zhang, A., & Resnick, P. (2025) · PNAS Nexus · doi:10.1093/pnasnexus/pgaf111 · Cited by 2 · see citing works
Duskin, K. (2024) · Web Science Conference · doi:10.1145/3630744.3658615 · Cited by 2 · see citing works
“Researchers have examined policies at Facebook [8], Twitter [40], and Reddit [38] with these methods.”
BackgroundComplexity of the online distrust ecosystem and its evolution
Illari, L., Restrepo, N. J., & Johnson, N. F. (2024) · Frontiers in Complex Systems · doi:10.3389/fcpxs.2023.1329857 · Cited by 2 · see citing works
Modeling the amplification of epidemic spread by misinformed populations
Deverna, M. R., Pierri, F., Ahn, Y.-Y., Fortunato, S., Flammini, A., & Menczer, F. (2024) · arXiv.org · doi:10.48550/arxiv.2402.11351 · Cited by 2
“They should provide public health authorities as well as social media platforms with heightened motivation to curb vaccine misinformation, despite the difficulties posed by social media design 11 .”
Alkhanishvili, Z. (2026) · PLOS Global Public Health · doi:10.1371/journal.pgph.0005037 · Cited by 1
“These frameworks have contributed valuable insights into how individuals acquire and interpret health-related information and how inaccurate claims circulate within societies [4,6–8].”
InfluentialKhan, F., Khan, T. Z., & Malik, N. (2026) · Social Sciences Spectrum · doi:10.71085/sss.05.03.586 · Cited by 1 · see citing works
Wu, Y., & Yu, J.-Q. (2026) · Social science computer review · doi:10.1177/08944393261427645 · Cited by 1 · see citing works
Yanmaz, G., & Gürsoy, E. (2026) · Discover Public Health · doi:10.1186/s12982-026-01407-1 · Cited by 1 · see citing works
Thorbecke, L., Agarwal, A. K., & Guntuku, S. (2026) · npj Digital Public Health · doi:10.1038/s44482-025-00002-6 · Cited by 1 · see citing works
A dual typology of social media interventions and deterrence mechanisms against misinformation
Karami, A. (2025) · Harvard Kennedy School Misinformation Review · doi:10.37016/mr-2020-184 · Cited by 1 · see citing works
“Current studies tend to examine platform interventions in isolation or emphasize their technical aspects (Broniatowski et al. 2023; Vincent et al., 2022; Pennycook & Rand, 2019), rather than analyzing their intended impact or positioning them within broader deterrence or governance models.”
Social Media and HPV Vaccine Hesitancy: How Misinformation Affects Latino Parents.
Aragones, A., Bruno, D., Fridman, I., Sarria, I., Loia, R., & Pallasa, C. (2026) · Journal of community health · doi:10.1007/s10900-026-01631-5
Ruiz-Bailén, M., & Ruiz-Iniesta, M. D. C. (2026) · Journal of Evaluation in Clinical Practice · doi:10.1111/jep.70673
Cheng, L., Liu, D., & Yang, L. (2026) · Policy & Internet · doi:10.1002/poi3.70057
Ordak, M. (2026) · PLoS ONE · doi:10.1371/journal.pone.0355341
“These structural features can allow misleading material to persist and evolve despite formal moderation efforts, sustaining its visibility and influence [1].”
Khatiwada, M., Chen, Y.-T., Dochez, C., & Delputte, P. (2026) · Vaccines · doi:10.3390/vaccines14080663
“Notably, the anti-vaccine movement gained political traction during this time, with some prominent politicians/political affiliates advocating for re-evaluation of vaccination schedules, thereby amplifying vaccine hesitancy [15,18–20].”
Xu, W., & Li, N. (2026) · Frontiers in Public Health · doi:10.3389/fpubh.2026.1875500
Stop using Media Bias/Fact Check in research
Iglesias, A., Zimmerman, J., Fehr, A. M. A., Dodds, P., & Danforth, C. (2026) · arXiv.org · doi:10.48550/arxiv.2607.12108
“…[69]; “political partisanship and mis-trust of science” [70]; and “distrust in science [that] un-dermines public health and may drive civil unrest” [71], misinformation scholarship has ironically turned this successful attack into a scientific consensus (each of these research motivation quotes…”
Evaluating the impact of content warning labels on individuals with prior fringe beliefs
Horne, B. D. (2026) · Telematics and informatics · doi:10.1016/j.tele.2026.102433
(Nie)pewność: nauka w obiegu problematycznych informacji. Zaufanie, platformy i odbiorcy
Czerniawska, D., & Lompe, M. (2026) · doi:10.67180/uw.9788398159807
Saeed, M. H., Broniatowski, D. A., Simons, J. R., Gralla, E., Suri, M., & Ciampaglia, G. L. (2026) · arXiv.org · doi:10.48550/arxiv.2605.19204
“[10] The primary layers include users, where individual accounts can produce, share, and engage with content.”
InfluentialSelf-citationLi, Y., Chen, T., Zhao, Y., Ke, W., Pang, P., Mckay, D., Chang, S., & Baxter, N. (2026) · PLoS ONE · doi:10.1371/journal.pone.0346568
“Additionally, Broniatowski et al. [42] showed that Facebook’s misinformation removal efforts did not always decrease overall engagement with anti-vaccine content, as users adapted to platform restrictions.”
User anonymity and the informativeness of social media: evidence from a natural experiment
Huang, K., Wang, Y., Wong, T. J., & Zhang, T.-Y. (2026) · Review of accounting studies · doi:10.1007/s11142-026-09953-4 · Cited by 1 · see citing works
“Misinformation on social media during the recent Covid crisis is also widely documented (Ball and Maxmen 2020; Broniatowski et al. 2023).”
Quality Analysis of YouTube and Facebook Videos for Glaucoma Treatment Options
Sarrafpour, S., Maheshwari, A., Lee, J.-H., Young, B., Liu, J., & Teng, C. C. (2026) · Clinical Ophthalmology · doi:10.2147/opth.s575279
Karami, A., Kordzadeh, N., & Harn, S. (2026) · European Journal of Information Systems · doi:10.1080/0960085x.2026.2620412
Counterfactual Conditionals as Arguments in Public Debates: The Case of the COVID-19 Pandemic
Klinowski, M., Lisowski, B., & Szafarowicz, K. (2025) · International Journal for the Semiotics of Law · doi:10.1007/s11196-025-10258-z
Instrumenting the Online Information Environment
Shapiro, J. N. (2024) · The Annals of the American Academy of Political and Social Science · doi:10.1177/00027162251397820
“…users seeking antivaccine content could still access, engage with, and share antivaccine content from banned groups, thanks to Facebook’s structure (broniatowski et al. 2023). both papers were enabled by no-longer-available ApIs and unusually well-publicized policy changes. recent work very…”
What can public health communicators learn from Reddit? A perspective for the next pandemic
Bergenfeld, I. (2024) · Frontiers in Public Health · doi:10.3389/fpubh.2024.1348095
News and Misinformation Consumption in Europe: A Longitudinal Cross-Country Perspective
Baqir, A., Galeazzi, A., & Zollo, F. (2023) · arXiv.org · doi:10.48550/arxiv.2311.05487
“…Vicario et al., 2016; Zannettou et al., 2018; Lazer et al., 2018), the Covid-19 pandemic (Ferrara et al., 2020; Cinelli et al., 2020), vaccines (Broniatowski et al., 2023; Santoro et al., 2023), and elections (Grinberg et al., 2019), revealing differences in diffusion dynamics and prominence…”
BackgroundComplexity of the Online Distrust Ecosystem and its Evolution
Illari, L., Restrepo, N. J., & Johnson, N. F. (2023) · arXiv.org · doi:10.48550/arxiv.2310.19710
“Many other studies being published on similar themes, use CrowdTangle which is a commercial application tool owned by Facebook, and hence have claims and findings that rely entirely on the hope that CrowdTangle is accurate (Broniatowski et al. 2023a, 2023b).”
Background
- Authors
- Broniatowski, D. A., Simons, J. R., Gu, J., Jamison, A. M., & Abroms, L. C.
- Affiliations
- George Washington University (US)
- United States Department of Health and Human Services (US)
- Johns Hopkins University (US)
- Corresponding author
- Broniatowski, David A.
- Venue
- Science Advances
- Published
- 2023-09-15
- Volume
- 9
- Issue
- 37
- Pages
- eadh2132-eadh2132
- ISSN
- 2375-2548 (ISSN-L)
- PMC
- PMC11044214
- OpenAlex
- W4386766469
- Cited by
- 62
- References
- 76
- Citations by year
- 2026: 19 · 2025: 23 · 2024: 18 · 2023: 2
- FWCI
- 26.64
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by-nc
- Locations
- Science Advances (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- National Science Foundation (2029420, 2229885)
- John S. and James L. Knight Foundation
- Topics
- Social Sciences › Sociology and Political Science › Misinformation and Its Impacts
- Social Sciences › Communication › Communication and COVID-19 Impact
- Social Sciences › Health › Vaccine Coverage and Hesitancy
- Keywords
- vaccine misinformation, Facebook, COVID-19 pandemic, political polarization, content engagement
- MeSH terms
- COVID-19, Humans, Vaccines, Policy, Pandemics, Social Media
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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