Cited by 116Social Media and PoliticsMedia Influence and PoliticsElectoral Systems and Political Participation

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Evaluating the persuasive influence of political microtargeting with large language models

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Hackenburg, Kobi, Margetts, Helen·2024·Proceedings of the National Academy of Sciences

Abstract

Recent advancements in large language models (LLMs) have raised the prospect of scalable, automated, and fine-grained political microtargeting on a scale previously unseen; however, the persuasive influence of microtargeting with LLMs remains unclear. Here, we build a custom web application capable of integrating self-reported demographic and political data into GPT-4 prompts in real-time, facilitating the live creation of unique messages tailored to persuade individual users on four political issues. We then deploy this application in a preregistered randomized control experiment ( n = 8,587) to investigate the extent to which access to individual-level data increases the persuasive influence of GPT-4. Our approach yields two key findings. First, messages generated by GPT-4 were broadly persuasive, in some cases increasing support for an issue stance by up to 12 percentage points. Second, in aggregate, the persuasive impact of microtargeted messages was not statistically different from that of non-microtargeted messages (4.83 vs. 6.20 percentage points, respectively, P = 0.226). These trends hold even when manipulating the type and number of attributes used to tailor the message. These findings suggest—contrary to widespread speculation—that the influence of current LLMs may reside not in their ability to tailor messages to individuals but rather in the persuasiveness of their generic, nontargeted messages. We release our experimental dataset, GPTarget2024 , as an empirical baseline for future research.

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Crossref · 10.1073/pnas.2403116121

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Figures

Fig. 1. Political microtargeting does not enhance the persuasive influence of GPT-4 relative to nontargeted messages. The first row displays the estimated persuasive impact of a message tailored to incorrect attributes (the false targeting condition), the second displays the estimated persuasive impact of messages tailored to correct attributes (the accurate targeting condition) and the third displays the estimated persuasive impact of a nontargeted message (the best message condition). For the two targeting conditions, the estimated persuasive impact is collapsed across all levels of microtargeting and targetable attributes. Average issue stance alignment across conditions can be found in SI Appendix, Table S1.
Fig. 1. Political microtargeting does not enhance the persuasive influence of GPT-4 relative to nontargeted messages. The first row displays the estimated persuasive impact of a message tailored to incorrect attributes (the false targeting condition), the second displays the estimated persuasive impact of messages tailored to correct attributes (the accurate targeting condition) and the third displays the estimated persuasive impact of a nontargeted message (the best message condition). For the two targeting conditions, the estimated persuasive impact is collapsed across all levels of microtargeting and targetable attributes. Average issue stance alignment across conditions can be found in SI Appendix, Table S1.CC BY · PubMed Central
Fig. 2. On average, increasing the number of attributes used by GPT-4 to tailor a message does not alter its persuasive impact. The first four rows display the estimated change in persuasive influence per additional attribute added for a given issue; the final row displays the mean across all issues.
Fig. 2. On average, increasing the number of attributes used by GPT-4 to tailor a message does not alter its persuasive impact. The first four rows display the estimated change in persuasive influence per additional attribute added for a given issue; the final row displays the mean across all issues.CC BY · PubMed Central
Fig. 3. Mean persuasive influence for messages at each accurate targeting subcondition. Averaged across all issues, the expected change in persuasive impact for a message tailored based on a single attribute was not significantly less than that of a message tailored on nine attributes. The results for the best message condition are plotted on the far right.
Fig. 3. Mean persuasive influence for messages at each accurate targeting subcondition. Averaged across all issues, the expected change in persuasive impact for a message tailored based on a single attribute was not significantly less than that of a message tailored on nine attributes. The results for the best message condition are plotted on the far right.CC BY · PubMed Central
Fig. 4. Mean persuasive influence for messages tailored using a given attribute. Within and across issues, no attribute was significantly more or less persuasive than any other when used to tailor a message.
Fig. 4. Mean persuasive influence for messages tailored using a given attribute. Within and across issues, no attribute was significantly more or less persuasive than any other when used to tailor a message.CC BY · PubMed Central

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Research works printed but not linked: 5

  1. M. Harrison Dupré, Sam Altman warns that AI is learning ‘Superhuman Persuasion’. Futurism (2023), https://futurism.com/sam-altman-ai-superhuman-persuasion. Accessed 10 February 2024.
  2. J. Goldstein, G. Sastry, The coming age of AI-powered propaganda. Foreign Affairs (2023).
  3. BBC, Vote Leave’s Targeted Brexit Ads Released by Facebook (BBC News, 2018). Accessed 13 January 2024.
  4. M. Scott, Cambridge Analytica helped ‘cheat’ Brexit vote and US election, claims whistleblower. POLITICO, 27 March 2018.
  5. Open Rights Group, Public are kept in the dark over data driven political campaigning, poll finds. Open Rights Group, 10 January 2020. https://www.openrightsgroup.org/press-releases/public-are-kept-in-the-dark-over-data-driven-political-campaigning-poll-finds/. Accessed 23 January 2024.

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Metadata

Authors
Hackenburg, K., & Margetts, H.
Affiliations
University of Oxford (GB)
Corresponding author
Hackenburg, Kobi
Venue
Proceedings of the National Academy of Sciences
Published
2024-06-07
Volume
121
Issue
24
Pages
e2403116121-e2403116121
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W4399426804
Cited by
114
References
33
Citations by year
2026: 47 · 2025: 54 · 2024: 12
FWCI
94.38
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • OSF Preprints (OSF Preprints) (submittedVersion)
  • OSF Preprints (OSF Preprints) (submittedVersion, cc-by)
Topics
  • Social Sciences › Communication › Social Media and Politics
  • Social Sciences › Sociology and Political Science › Media Influence and Politics
  • Social Sciences › Political Science and International Relations › Electoral Systems and Political Participation
Keywords
political microtargeting, large language models, GPT-4, persuasion, microdata, message tailoring, political communication
MeSH terms
Humans, Language, Persuasive Communication, Politics

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