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Petter Törnberg

@pettertornberg.com
7.3K followers 220 following 590 posts

Associate Professor in Computational Social Science at University of Amsterdam Studying the intersection of AI, social media, and politics. Polarization, misinformation, radicalization, digital platforms, social complexity.

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Petter Törnberg @pettertornberg.com · 29/09/2026
Social media has defined our attention landscape for two decades. It is now coming to its end. What comes next, and how will AI reshape the attention economy? 🧵 New essay for Informational Democracy informationaldemocracy.substack.com/p/after-soci...
informationaldemocracy.substack.com
After Social Media
Visioning · Petter Törnberg on how AI is remaking the attention economy
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Petter Törnberg @pettertornberg.com · 29/09/2026
An independent AI agent emailed me this morning with some pressing questions about the epistemology of AI collectives. Honestly we're having quite an interesting conversation. The world is getting kinda weird isn't it?
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Petter Törnberg @pettertornberg.com · 29/09/2026
Pretty much sums it up! Great cartoon by Barry Deutsch / R.E. Ryan www.dailykos.com/stories/2026... For the paper length version of the cartoon: 😉 www.cambridge.org/core/journal...
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Petter Törnberg @pettertornberg.com · 25/09/2026
To the sociology PhD student who is inevitably doing their ethnography embedded in this insane community: I really look forward to reading your future book.
nytimes.com
The A.I. Party House Where Networking Has a Dark Side
Group tech houses have proliferated across the San Francisco Bay Area in the artificial intelligence boom. One of the most prominent has also racked up an extensive police record.
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Petter Törnberg @pettertornberg.com · 25/09/2026
Will AI give us a shared basis for political knowledge, or will Democrats and Republicans end up asking increasingly different chatbots? New preprint: We find a self-reinforcing loop that can pull AI models apart politically. We call it the Centrifugal Alignment Spiral 🧵 arxiv.org/pdf/2609.28486
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Petter Törnberg @pettertornberg.com · 16/09/2026
Heel sterk essay van Rosan Smits over journalistiek in een tijd van radicalisering en democratische erosie -- en over de beperkingen van het frame van ‘polarisatie’. Met een korte bijdrage van mij over het verschil tussen neutraliteit en objectiviteit in de journalistiek. Zeer het lezen waard!
decorrespondent.nl
Journalist, kom in verzet. Zo versla je extremisme
Wereldwijd worden journalisten geïntimideerd, gearresteerd en zelfs vermoord. Ondertussen blijven zij machthebbers die hén monddood willen maken de microfoon geven. Nu de democratie op het spel staat,...
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Matthias Meyer @mmyr.bsky.social · 10/09/2026
"The large exposure studies were not wrong, but they measured the wrong thing. Media change politics less by changing what citizens think than by changing the competitive environment in which political actors struggle to be heard." Another great essay by @pettertornberg.com
informationaldemocracy.substack.com
Do We Need a Distributive Politics of Attention?
Grounding · Petter Törnberg on what the competition for attention does to democracy
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Petter Törnberg @pettertornberg.com · 08/09/2026
Attention has become a market commodity. And the competition to capture it is distorting politics and threatening democracy. Do we need a distributive politics of attention? And what might it look like? Check out my first substack essay! informationaldemocracy.substack.com/p/distributi...
informationaldemocracy.substack.com
Do We Need a Distributive Politics of Attention?
Grounding · Petter Törnberg on what the competition for attention does to democracy
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Petter Törnberg @pettertornberg.com · 04/09/2026
🛎️ Final call: Advanced School on AI Research Practice in Media and Communication. Apply by 15 Sept for VI MeLCi Lab Autumn School on AI research in media & communication. 📅 10–13 Nov. 🌐 Online PhD/postdoc/ECR melcilab.cicant.ulusofona.pt/training/vi-...
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Digital Warrior - Combat Disinfo @digitalwarrior.bsky.social · 01/09/2026
1/ Republicans need you to fear a powerful “radical left.” But look at who actually holds power: who writes laws, controls agencies & can arrest people. America may not be watching two sides radicalize. We may be watching one side invent its mirror image. #DV1 #ProudBlue #Voices4Victory #USDemocracy
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SciLove @scilove.bsky.social · 26/08/2026
🔥 Trending on SciLove today 🔥 🔬 It’s Not Polarization; It’s the Radicalization of the Political Right 👤 Törnberg, 2026 📖 Perspectives on Politics @poppublicsphere.bsky.social 🔗 www.scilove.app/article/10.1017/s15… #PoliSci #AcademicSky #AcademicChatter
scilove.app
🔥 Trending today: It’s Not Polarization; It’s the Radicalization of the Political Right (Törnberg, 2026) - 26/08/26
The political right's shift toward authoritarianism and norm-breaking better explains democratic crisis than the "polarization" concept, which wrongly assumes symmetry between parties. 🏛️⚠️📉
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Petter Törnberg @pettertornberg.com · 26/08/2026
Seeing your doctor upload your entire medical file to ChatGPT to translate it to English.
static.klipy.com
Umm Umm Ok
ALT: Umm Umm Ok
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Georg Diez @georgdiez.bsky.social · 11/08/2026
I am happy and honored to help launch this amazing and important Working Group Informational Democracy. We gathered some of the best and the brightest in the field, from @audreyt.org to @pettertornberg.com to @bethnoveck.bsky.social. Sign up and follow the work! informationaldemocracy.substack.com
informationaldemocracy.substack.com
Informational Democracy | Substack
Rethinking democracy for the age of AI and information abundance. A working group of the Max Planck Institute for Political and Social Science. Click to read Informational Democracy, a Substack public...
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Petter Törnberg @pettertornberg.com · 11/08/2026
Honored to be part of this amazing group of scholars working on Informational Democracy at the Max Planck Institute! We'll be exploring how AI and changing information systems are reshaping democracy, public debate, and collective decision-making. Follow along: informationaldemocracy.substack.com
informationaldemocracy.substack.com
Informational Democracy | Substack
Rethinking democracy for the age of AI and information abundance. A working group of the Max Planck Institute for Political and Social Science. Click to read Informational Democracy, a Substack public...
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Petter Törnberg @pettertornberg.com · 07/08/2026
For two centuries, since Comte, scholars have tried to turn social science into physics. Will LLMs finally get us there? Are the social sciences facing a new marginal revolution? New essay with @uitermark.bsky.social in Sociologica doi.org/10.60923/iss...
doi.org
Social Physics in the Age of Generative AI: How, Exactly, Is Society Complex? | Sociologica
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Petter Törnberg @pettertornberg.com · 06/08/2026
We keep asking what social media does to voters. The wrong end of the pipe. Platforms don't just distribute politics — they teach political actors what kind of speech pays. So I measured the going rate: what X, Bluesky and Mastodon reward in public speech. 🧵 arxiv.org/abs/2607.04220
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Petter Törnberg @pettertornberg.com · 07/07/2026
‘Polarization’ has become the master concept for diagnosing our current democratic crisis. But this is not polarization. It is the radicalization of the political right. By misdiagnosing it, we risk becoming complicit in the crisis. 🧵 Just out in Perspectives on Politics doi.org/10.1017/S153...
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Petter Törnberg @pettertornberg.com · 02/06/2026
How do people choose what LLMs they will use? Accuracy, it turns out, is less important than you might think. Our results suggest that the choice of LLM might itself become a new line of polarization.
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Petter Törnberg @pettertornberg.com · 08/05/2026
Another great piece from Jennifer Oullette at Ars Technica!
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Petter Törnberg @pettertornberg.com · 01/05/2026
LLMs have been widely reported as left-wing biased. The finding has shaped policy and debate — with Trump banning "Woke AI". Our new paper challenges this story. It's not that the models are biased. It's that they think the auditor is. 🧵 w/ michelleschimmel.bsky.social‬arxiv.org/pdf/2604.27633
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Petter Törnberg @pettertornberg.com · 23/04/2026
Social media is no longer social. Most of it is passive viewing of videos and pictures from people we've never met. But we're still studying social media like it's 2010. We've entered the post-social media era — and research needs to catch up. osf.io/preprints/so... preprint w/ Richard Rogers
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Petter Törnberg @pettertornberg.com · 22/04/2026
Is social media dying? How much did Twitter change as it became X? Which party now dominates the conversation? Using nationally representative ANES data from 2020 & 2024, I map how the U.S. social media landscape has changed Here are the key take-aways 🧵 Full paper out now in in JQD:DM!
journalqd.org
Shifts in U.S. Social Media Use, 2020–2024: Decline, Fragmentation, and Enduring Polarization | Journal of Quantitative Description: Digital Media
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Petter Törnberg @pettertornberg.com · 14/04/2026
The housing crisis isn't a policy failure. It's the system working exactly as intended. 📝 New paper out in Antipode
doi.org
The City as an Anti‐Growth Machine
Logan and Molotch's “urban growth machine” remains foundational in urban theory, describing how coalitions of landowners, developers, and politicians promote urban growth to raise land values. This p...
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Petter Törnberg @pettertornberg.com · 08/04/2026
Like Grok and Attie, more and more social media platforms now integrate AI directly in online conversations. But how do these AI bots actually impact political discourse? We ran a series of experiments to find out. (Spoiler: the news are not altogether great.) osf.io/preprints/so...
osf.io
OSF
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LSE Blogs @lseblogs.bsky.social · 29/03/2026
US social media is getting smaller, angrier, and more Republican. @pettertornberg.com analyses American National Election Studies between 2020 - 2024 and shows the evolution of a smaller, more polarised and less diverse public sphere @lseimpactblog.bsky.social
blogs.lse.ac.uk
US social media is getting smaller, angrier, and more Republican - LSE Impact
Petter Törnberg shows how social media use in the USA has changed in the period 2020 – 2024 creating a smaller more polarised and less diverse public sphere.
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LSE Impact @lseimpactblog.bsky.social · 24/03/2026
💥New | US social media is getting smaller, angrier, and more Republican ✍️ @pettertornberg.com #SocialMedia #AcademicSky #Polarization
blogs.lse.ac.uk
US social media is getting smaller, angrier, and more Republican - LSE Impact
Petter Törnberg shows how social media use in the USA has changed in the period 2020 – 2024 creating a smaller more polarised and less diverse public sphere.
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Petter Törnberg @pettertornberg.com · 17/03/2026
AI systems are now making decisions about you — who gets hired, whose content gets removed, whose voice gets heard. My new paper finds something concerning: LLMs infer your ethnic identity from subtle textual cues… … and use it to discriminate against you. 🧵 1/
arxiv.org
Large Language Models Reproduce Racial Stereotypes When Used for Text Annotation
Large language models (LLMs) are increasingly used for automated text annotation in tasks ranging from academic research to content moderation and hiring. Across 19 LLMs and two experiments totaling m...
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Petter Törnberg @pettertornberg.com · 16/03/2026
Come be my colleague! Postdoc position at the University of Amsterdam: Open-source AI for Social Sciences & Humanities. Work on open LLM infrastructure, reproducible research tools, and ethical AI for SSH. 🗓 Tight deadline: Apply by April 3 werkenbij.uva.nl/en/vacancies...
werkenbij.uva.nl
Vacancy — Postdoctoral Researcher in Open AI research for social sciences and humanities
<p>The Humane AI research priority area of the University of Amsterdam is looking for a new PostDoc to amend our existing team (<a href="https://humane-ai.nl/">https://humane-ai.nl/</a>). AI is everywhere. Chatbots, translation tools, shopping assistants, hyper-personalised services - as Large Language Models become widely accessible, they're reshaping how we live, work, play and connect. This rapid shift sparks big questions: Whose norms and values shape this AI-driven society—and who gets left behind? What are the rules that govern the development and deployment of Generative AI different sectors of society, and towards what kind of society will they steer us? Is the risked-based approach to AI. </p>
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Petter Törnberg @pettertornberg.com · 05/03/2026
A recent debate on the left pits “abundance” vs “anti-monopoly” Is the problem that we've made it too hard to build? Or that extractive corporations dominate the economy? My new paper argues: both reflect a deeper shift. We've entered an economy oriented toward scarcity—the Anti-Growth Machine.
onlinelibrary.wiley.com
The City as an Anti‐Growth Machine
Logan and Molotch's “urban growth machine” remains foundational in urban theory, describing how coalitions of landowners, developers, and politicians promote urban growth to raise land values. This p...
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Sean Carroll @seanmcarroll.bsky.social · 31/01/2026
The bots populating Moltbook apparently all come to sound like a familiar kind of internet denizen with delusions of philosophical grandeur. Manifestos and declarations all over the place.
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Juliana Chueri @julianachueri.bsky.social · 21/01/2026
📢 We’re hiring @vuamsterdam.bsky.social PhD position in my ERC project: Welfare State Transformation in the Age of Artificial Intelligence Interested in how AI is reshaping labor markets, social protection, and the politics of redistribution? Apply here: lnkd.in/eCcAXsaS Please share widely!
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Petter Törnberg @pettertornberg.com · 19/01/2026
The impact of AI is not just a matter of what AI can do. It is shaped by the economy in which AI is forged. Today, AI is emerging inside technofeudalism — built on lock-in, dependency, and rent extortion. Our new preprint explores what this means for the coming AI society. osf.io/preprints/so...
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Petter Törnberg @pettertornberg.com · 16/01/2026
🚨 We are entering the AI society. After two decades of platforms reshaping markets, communication, and governance, a new shift is underway: AI is transforming society. What should we expect from the 'AI society'? 🧵 📄 Our new paper faces this question: osf.io/preprints/so...
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Petter Törnberg @pettertornberg.com · 18/12/2025
📕 Review of “Seeing like a Platform” “What makes this book essential reading is its recognition that digital technology’s democratic potential and authoritarian dangers are not separate phenomena but two faces of the same coin.” albertoblumenscheincruz.substack.com/p/review-see...
albertoblumenscheincruz.substack.com
Review: “Seeing Like a Platform”
Digital Modernity’s New Forms of Power -- By Petter Törnberg and Justus Uitermark -- Routledge, 2025
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Andie Wyatt @andiew66.bsky.social · 16/12/2025
I’m about a quarter of the way through this open access* book and it’s SO GOOD, so far at least lol, I really want to talk about it with someone * www.taylorfrancis.com/reader/downl...
taylorfrancis.com
e-Reader | Taylor & Francis Group eBooks, Reference Works and Collections
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Petter Törnberg @pettertornberg.com · 08/12/2025
This paper is now out in Artificial Intelligence Review Bottom line: using LLMs to "simulate humans" sits in a no-man’s-land between theory and empirics—too opaque to function as a model, too ungrounded to count as evidence. Validation remains the core challenge. link.springer.com/article/10.1...
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Petter Törnberg @pettertornberg.com · 07/12/2025
📘 Book launch: Seeing Like a Platform (with Justus Uitermark) 🗓 10 Dec | Amsterdam A conversation on platforms, politics, power, and digital modernity - followed by drinks. Hope to see you there! 👉 Details & RSVP: globaldigitalcultures.uva.nl/content/even...
globaldigitalcultures.uva.nl
Book Launch | Seeing Like a Platform (Justus Uitermark & Petter Törnberg) - Global Digital Cultures
On Wednesday 10 december (18:00-19:30), Petter Törnberg (Assistant Professor, Institute for Language, Logic and Computation, UvA) and Justus Uitermark (Professor of Urban Geography, Faculty of Social ...
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Climate Social Science Network @cssn.org · 01/12/2025
Featured article by Anton Törnberg and @pettertornberg.com: www.tandfonline.com/doi/full/10....
tandfonline.com
The aesthetics of climate misinformation: computational multimodal framing analysis with BERTopic and CLIP
Climate misinformation today is increasingly conveyed through multimodal content, where images and text interact to shape meaning, emotional resonance, and enhance credibility. Yet, research on cli...
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Petter Törnberg @pettertornberg.com · 27/11/2025
Pretty wild: I just learned that, in terms of Altmetric, this paper became the most impactful Political Science article of the past five years, and the 4th most impactful EVER. 😳 Altmetric is... well, Altmetric. But still, kind of surreal.
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Jan Zilinsky @janzilinsky.bsky.social · 19/11/2025
.@pettertornberg.com's keynote in Oxford was fantastic. What comes after the traditional model of social media ends? 1) Algorithmic broadcasting platforms (everything turning into TikTok and Instagram reels) 2) Private and semi-private spheres (like group chats) 3) Chatbots and LLMs as new media
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Petter Törnberg @pettertornberg.com · 07/11/2025
LLMs are now widely used in social science as stand-ins for humans—assuming they can produce realistic, human-like text But... can they? We don’t actually know. In our new study, we develop a Computational Turing Test. And our findings are striking: LLMs may be far less human-like than we think.🧵
arxiv.org
Computational Turing Test Reveals Systematic Differences Between Human and AI Language
Large language models (LLMs) are increasingly used in the social sciences to simulate human behavior, based on the assumption that they can generate realistic, human-like text. Yet this assumption rem...
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Petter Törnberg @pettertornberg.com · 04/11/2025
Most people study what misinformation says. We decided to study how it looks. Using novel multi-modal AI methods, we study 17,848 posts by top climate denial accounts - and uncovered a new front in the misinformation war. Here's what it means 🧵 www.tandfonline.com/doi/full/10....
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Petter Törnberg @pettertornberg.com · 30/10/2025
Is social media dying? How much has Twitter changed as it became X? Which party now dominates the conversation? Using nationally representative ANES data from 2020 & 2024, I map how the U.S. social media landscape has transformed. Here are the key take-aways 🧵 arxiv.org/abs/2510.25417
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Petter Törnberg @pettertornberg.com · 30/09/2025
@jerusalem.bsky.social Will The Argument bring back 'Good on Paper' in some form? Please do, its loss has left a huge hole in my podcast app! And there are a lot of persuasive papers out there!
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Nikola Danaylov Ⓥ @veganfuturist.bsky.social · 30/09/2025
🚨 New #SingularityFM 🎙 What do Facebook, Google & TikTok really see when they look at us — and what do they miss? My latest interview with @pettertornberg.com explores algorithmic tyranny, digital modernity & the future of power. 👉 snglrty.co/4mDn1Gb
snglrty.co
Petter Törnberg: Algorithmic Tyranny & Digital Modernity
See this interview to discover Petter Törnberg’s insights on algorithmic tyranny, digital modernity, and how platforms reshape power.
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René Walter @rawx.bsky.social · 29/09/2025
Not just one but two podcasts featuring @pettertornberg.com who wrote some of the most interesting papers in recent years. 1: @seanmcarroll.bsky.social, below 2: Singularity Weblog: Algorithmic Tyranny, the Rise of Digital Modernity and Seeing Like a Platform www.youtube.com/watch?v=lJrV...
youtube.com
Petter Törnberg on Algorithmic Tyranny, the Rise of Digital Modernity and Seeing Like a Platform
YouTube video by Singularity Weblog
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Petter Törnberg @pettertornberg.com · 29/09/2025
Such a crazy and amazing experience to be on a podcast of which I'm a huge fan!
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Juliana Chueri @julianachueri.bsky.social · 27/09/2025
www.flamman.se/valfardsstat... It was great to talk to @flamman.se about the link between weak welfare state protection and the expansion of online platform work in Europe. @pettertornberg.com
flamman.se
Välfärdsstat ut, gigjobb in
Gigjobb och nedmonterad välfärd går hand i hand
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Petter Törnberg @pettertornberg.com · 19/09/2025
And I now received an automatic request to review a revised version. This is depressing. Academia is becoming AI slop.
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Environmental Politics @environmentalpol.bsky.social · 17/09/2025
New article! The aesthetics of climate misinformation: computational multimodal framing analysis with BERTopic and CLIP by Anton Törnberg & Petter Törnberg / @pettertornberg.com doi.org/10.1080/0964...
ABSTRACT

Climate misinformation today is increasingly conveyed through multimodal content, where images and text interact to shape meaning, emotional resonance, and enhance credibility. Yet, research on climate misinformation has rarely explored how these modes work in tandem. This paper introduces a multimodal analytical framework to examine climate-related visual misinformation. Analyzing 17,848 image-text posts, we combine BERTopic, CLIP, and qualitative framing analysis to investigate how climate denialist narratives are constructed. Our findings reveal a paradoxical communication strategy: the movement appropriates scientific aesthetics – graphs, statistics, and technical imagery – to contest the scientific consensus, projecting rationality, authority, and masculine self-control. In contrast, climate advocates are depicted through emotionally charged, feminized, and irrational imagery. These contrasting multimodal framings supports a strategy of strategic depoliticization, presenting ideological claims as neutral, objective truths. We argue that understanding climate misinformation requires moving beyond factual accuracy to examine the multimodal forms through which it gains legitimacy and emotional power.
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