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Manoel Horta Ribeiro

@manoelhortaribeiro.bsky.social
1.5K followers 465 following 348 posts

Assistant Professor @ Princeton Previously: EPFL 🇨🇭, UFMG 🇧🇷 Interests: Computational Social Science, Platforms, GenAI, Moderation

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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 06/10/2026
🚨SciConBench accepted at #NeurIPS2026! Paper: arxiv.org/abs/2606.11337 Can AI *synthesize* scientific conclusions in health? We find that, on medical conclusions, we are far from it! Check out our live dashboard: sciconbench.cs.princeton.edu led by @hayoungjung.bsky.social
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 02/10/2026
New blog post! I argue that the “stochastic parrots” metaphor dismisses LLM capabilities by reducing them to “haphazardly stitching together” text... ...but retreats to the trivially true claim that LLMs predict the next token when challenged. doomscrollingbabel.manoel.xyz/p/of-mottes-...
doomscrollingbabel.manoel.xyz
Of Mottes, Baileys, and Stochastic Parrots 🦜
Every six months, Twitter and Bluesky circle back to whether LLMs are “stochastic parrots,” though the debate has become increasingly confusing as proponents of the metaphor have started using it in v...
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Penn Center on Media, Technology, and Democracy (MEDIATED) @penn-mediated.bsky.social · 23/09/2026
Do algorithms drive online polarization? A review by Duncan Watts and coauthors finds the evidence is inconclusive. What users seek out matters too, though platforms aren't off the hook. infodem.upenn.edu/research-com...
infodem.upenn.edu
Research Compendium - Center on Media, Technology and Democracy
News, announcements, and insights from the Penn Center on Media, Technology, and Democracy.
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Ted Underwood @tedunderwood.com · 22/09/2026
Models like Talkie-1930 sound like voices from the past. If they could reliably speak from specified historical vantage points, researchers might also use them to simulate the past. But how reliable are they? Today we release a benchmark answering that question for English contexts 1831-1930.
Free-text evaluation of answers to character modeling and constrained generation questions. This is just one of several scores Chronologic-EN can produce; we focus on it here because it's both the hardest test and the one most relevant to simulation of the past. Frontier models reach 72%; Talkie-1930 is stronger than several larger competitors, but not at the frontier by this measure. Note that this score has improved ~45% in the last two years, but still falls perceptibly short of ground truth.
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Maria Antoniak @mariaa.bsky.social · 14/09/2026
We're hiring in Computer Science at the University of Colorado Boulder! ☀️⛰️ Machine learning and NLP people, please apply!
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JHU Computer Science @jhucompsci.bsky.social · 09/09/2026
Get to know Assistant Professor @tiziano.bsky.social in our New Faculty Q&A:
cs.jhu.edu
New faculty Q&A: Tiziano Piccardi
Get to know Tiziano Piccardi, who joins Johns Hopkins as an assistant professor of computer science and a member of the Data Science and AI Institute.
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 09/09/2026
Maybe we should anthropomorphize AI systems (a tiny bit!) My latest blog post for Doomscrolling Babel is on dogs, parrots, Dennett, agent civilizations, and why human concepts can help generate useful hypotheses about how AI systems behave. doomscrollingbabel.manoel.xyz/p/in-favor-o...
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Farnaz Jahanbakhsh @farnazj.bsky.social · 09/09/2026
What would it look like to move beyond normatively imposing a single set of values on everyone, and instead build generative AI systems that adapt to the values that matter most to each person in each situation? Excited that our work led by @rashonpoole.bsky.social will be at EMNLP!
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Deen Freelon @dfreelon.bsky.social · 11/08/2026
We got new research out today y'all--if you study TikTok, buckle up because we found something wilddddd... arxiv.org/abs/2608.09917 (accepted @ ICWSM 2027)
arxiv.org
WhichTok? Comparing Three TikTok Data Acquisition Tools
TikTok's global growth has made it a prime platform for both entertainment and political discourse, prompting increased social science research. However, this rapidly evolving research field faces a f...
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Ziv Epstein @ziv-e.bsky.social · 19/08/2026
Do our social media algorithms correctly reflect our values? Our new article published today in @pnas.org shows that the answer is often not, and that the content that gets promoted into their ranked feeds is often actively counter to our values.
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 15/08/2026
What if AI is just normal technology? The human enterprise of science will continue with AI, as it continued with computers and search engines. We must adapt to this new reality since collective abstinence is an unlikely equilibrium!
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 06/08/2026
zuck is like: guys our agent also needs to hack other companies, that‘s what frontier labs do
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Georg Ahnert @ahnert.eurosky.social · 31/07/2026
This morning at #ic2s2 I have the chance to present ongoing work on applying a SEM from survey methods to LLM text annotations: 👉 Evaluating LLM Text Annotations Without Ground Truth 📍10:45, Mansfield (210), Understanding LLMs w/ @maximiliankreutner.bsky.social Alex Cernat & @mstrohm.bsky.social
Scatterplot that shows high correlation (r=0.97) and high NDCG@10 between estimated and true annotator quality for data from the Manifestos project
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 29/07/2026
@inhwa.bsky.social and @mariannealq.bsky.social presenting our ongoing work on news knowledge and anxiety. Our internal joke is that this project is to figure out what can make people both ‘chill’ and informed!
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 29/07/2026
@mariannealq.bsky.social and @isabelcorpus.bsky.social presenting their work on local variations on AI overviews! They find that AI overviews are much better in high information environments.
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 29/07/2026
#ic2s2 these are the coolest slides i’ve ever seen
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Mor Naaman @informor.bsky.social · 29/07/2026
Let me start by changing my own practices! 🤦‍♂️ But I think the recent reporting checklist paper at NHB (led by @sfeuerriegel.bsky.social) is relevant to the discussion. www.nature.com/articles/s41...
nature.com
A reporting checklist for large language models in behavioural science - Nature Human Behaviour
Large language models offer new opportunities for behavioural science, but their rapid evolution poses challenges for research rigour. We introduce a consensus-based reporting checklist to improve tra...
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David Lazer @davidlazer.bsky.social · 29/07/2026
(feel free to complain to me to) And for the #IC2S2 crowd, I'll also point to the work of the Coalition of Independent Technology Research in helping protect CSS research & researchers, and encourage you to join the organization. independenttechresearch.org
independenttechresearch.org
Home - Coalition for Independent Technology Research
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Kristina Gligoric @IC2S2 @gligoric.bsky.social · 28/07/2026
Attending #IC2S2!! Will be co-organizing a tutorial on Simulating Human Survey Responses with Large Language Models, today at 1.15PM, and presenting on Friday in the Understanding Large Language Models session, 10.45AM. Looking forward to catching up with old friends and meeting new ones!!
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 28/07/2026
Headed to @ic2s2.bsky.social today!! Excited to meet old friends and make new ones! Come say hi! Also, bringing most of my lab with me for the first time! (The dog remained at @princetoncitp.bsky.social to supervise the remaining lab members) #IC2S2
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 26/07/2026
❓❓Should LLMs have access to ACM’s Digital Library❓❓ I wrote a short essay arguing that "yes!" I try to argue that, even if you are concerned about their negative impact on science, denying them access is a poor way to address their harm! doomscrollingbabel.manoel.xyz/p/science-sh...
doomscrollingbabel.manoel.xyz
Science Should Be Open, For LLMs Too
Even if you think LLMs are bad for science, you should let them have access to research papers
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Carl T. Bergstrom @carlbergstrom.com · 21/07/2026
1. We—@eduede.bsky.social, @mjcrockett.bsky.social, Kevin Gross, and I—have a new preprint on the arXiv today, based on ideas that emerged during an @sfiscience.bsky.social workshop in November 2024: The unintended consequences of large language models as a labor-augmenting technology in science.
arxiv.org
The unintended consequences of large language models as a labor-augmenting technology in science
As a labor-augmenting technology, large language models (LLMs) have the potential to accelerate scientific activity across the research pipeline. But even if LLMs perform on par with human experts at ...
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 20/07/2026
Hot take: ACM should just provide torrents called all_papers_{year_month_day}.tar.gz and let anyone download it!
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 19/07/2026
Spaaaaaaaaaaaaaaaaain
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Maria Antoniak @mariaa.bsky.social · 17/07/2026
Not a lot of info here about what kinds of agreements, with whom, and finances. But another example of data opening up for “AI” that wasn’t open for researchers. I fought many data wrangling battles at Semantic Scholar over missing ACM data. All research papers should be open access!
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 07/07/2026
Goooo Egyptttt
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 29/06/2026
Just back from vacation, and very hyped for today's Brazil vs. Japan game. As a Brazilian, one of the most endearing things is seeing other countries (esp. other developing ones) show affection for our team! We don't deserve you all! Below is the least I expect from today's game :-)
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 28/06/2026
I swear that never, ever again, will I take a connecting flight through Frankfurt
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Maria Antoniak @mariaa.bsky.social · 19/06/2026
New work from my lab! @teagrjohnson.bsky.social built a 12-dimensional narrative framework, annotated Dolma (no small feat given its extreme diversity), and analyzed narrative features across pretraining subsections. Highlight: pretraining data space displays strong narrative organization!
Figure 1: A web passage scored across our 12 narrative dimensions. Agency and setting dimensions are rated on a 1–5 Likert scale, temporal sequencing and causal density are passage-level proportions (0–1), and event density is the rate of event triggers per token. This passage scores high on agency and event features but low on setting, a “narrative profile” commonly seen across first-person web narratives.Figure 6: UMAP reduction of SBERT embeddings for 20,000 randomly sampled NARRADOLMA documents, colored by PC1 score (interiority). Labels are based on manual examination. Overlays for all three PCs appear in Fig. A5.
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 19/06/2026
Hot take: "AI slop" is a bad term and blurs the debate on the value of AI-generated content. doomscrollingbabel.manoel.xyz/p/ai-slop-isnt
doomscrollingbabel.manoel.xyz
AI Slop Isn’t
AI slop is a silly term, and we should abandon it
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 18/06/2026
Please join our interview study 🙏
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 11/06/2026
New preprint! We introduce a new benchmark, SciConBench, with 9.11k scientific questions derived from Cochrane Systematic Reviews. We find evidence that frontier AI agents **cannot** synthesize scientific conclusions well. A thread 🧵 w/ @hayoungjung.bsky.social & others!
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Ted Underwood @tedunderwood.com · 10/06/2026
Quite a list of authors. See also Diyi Yang, @mariaa.bsky.social , M Sagalnik, @manoelhortaribeiro.bsky.social , &c
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Romina Mahinpei @rmahinpei.bsky.social · 03/06/2026
📝Excited to share our new preprint, “AI Assistance for Discretionary Work: Increasing Feedback Provision in Higher Education”: arxiv.org/abs/2606.03095 A thread 🧵 1/8
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 03/06/2026
🚨New preprint!🚨 arxiv.org/abs/2606.03095 In a randomized field experiment in a 300-level machine learning course, teaching assistants received AI-assisted feedback drafts after grading student submissions. Did AI help them provide more feedback when feedback was optional? A thread 🧵
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Damon Beres @damonberes.com · 02/06/2026
“a town supervisor on Long Island had to debunk a rumor about a new data-center project after an inaccurate AI-generated search summary attracted so much attention that residents planned a protest (which they promoted with a flyer that itself appeared to be AI-generated).” @kait.bsky.social
theatlantic.com
The Rise of Anti-AI AI Slop
Anti-AI sentiment is genuine, but its online expression looks stranger and stranger.
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 01/06/2026
In a new blog post, I reminisce about the Web I grew up in and argue that AI is only the latest blow to an already dying notion of "the Web." I argue that we shouldn't be overly reactionary because much of what AI threatens isn't worth saving. doomscrollingbabel.manoel.xyz/p/the-slow-u...
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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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Alondra Nelson @alondra.bsky.social · 21/05/2026
Three things said about AI and social science: it's a topic to study, a thing to critique, a tool to use. My new Daedalus essay argues these aren't three conversations; they're one. A 🧵 on "Field Theory: AI as Social Science Question, Object, and Tool." www.amacad.org/publication/...
amacad.org
Field Theory: AI as Social Science Question, Object & Tool
Uses of advanced artificial intelligence are changing how societies organize labor, govern, produce knowledge, and make meaning. In light of these developments, this essay argues that AI models, tools...
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 19/05/2026
In a new blog post, I argue that the anti-ai movement ought to distinguish between claims about the technology and the "project of AI," as defined by Vetsi et al. in their new paper. 🔗: doomscrollingbabel.manoel.xyz/p/the-anti-a...
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 09/05/2026
My new post discusses the probable future of AI-assisted shopping! Drawing on our recent paper, I argue that if LLMs become the interface through which we search, compare, and buy things, we need a much sharper line between advertising and advice! doomscrollingbabel.manoel.xyz/p/when-the-a...
doomscrollingbabel.manoel.xyz
When the AI Assistant Becomes the Ad
This post describes our recent paper: Commercial Persuasion in AI-Mediated Conversations
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 18/04/2026
In a post-CHI blog post, I talk about what I believe technology like the Anthropic Interviewer will mean for qualitative research. doomscrollingbabel.manoel.xyz/p/qualitativ...
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Princeton Center for Information Technology Policy @princetoncitp.bsky.social · 15/04/2026
What if you could have more agency over your social media feed? CITP researchers have built Bonsai to explore what happens when users can have that control. Try the app now on @bsky.app! getbonsai.org Team: @manoelhortaribeiro.bsky.social @andresmh.com @mariannealq.bsky.social Omar El Malki
4 people sitting and looking at cell phone screens while smiling
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 15/04/2026
Come check bonsai out Thursday at P114!!! 9am session 😴😪🎉
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 13/04/2026
I'm flying to Barcelona to attend @chi.acm.org! Let's hang out! :-)
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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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Maria Antoniak @mariaa.bsky.social · 07/04/2026
Important thread and paper. This is one of my biggest worries about chatbots, especially when combined with roleplay and any kind of user-chatbot "relationship." And now imagine persuasion for politics and other topics, not just purchasing choices...
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Manoel Horta Ribeiro @manoelhortaribeiro.bsky.social · 07/04/2026
LLMs will transform e-commerce in ways that consumer protection is unprepared for! Our new preprint finds that conversational AI can strongly steer consumer choices: sponsored product selection nearly tripled relative to traditional placement (N=2012). Link: arxiv.org/abs/2604.04263
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ændra. @aendra.com · 29/03/2026
Got a lovely shout-out in @devingaffney.com's phenomenal talk earlier. 😊 Always a joy to hear Devin speak; few people have their finger on the pulse of this ecosystem like he does. Probably my favourite talk of the conference so far.
Devin Gaffney discussing custom feeds, Trending News is shown as an example
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J. Nathan Matias @natematias.bsky.social · 27/03/2026
What does it take to prove causality in tech harms cases? After rulings in NM & CA, commentators are throwing around causality in arguments both for & against the results. If you’re frustrated by the causality maze, don’t worry- @penney.bsky.social & I have you covered tsjournal.org/index.php/jo...
tsjournal.org
Science and Causality in Technology Litigation | Journal of Online Trust and Safety
Journal of Online Trust and Safety
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