Manoel Horta Ribeiro
@manoelhortaribeiro.bsky.social
Assistant Professor @ Princeton
Previously: EPFL 🇨🇭, UFMG 🇧🇷
Interests: Computational Social Science, Platforms, GenAI, Moderation
Previously: EPFL 🇨🇭, UFMG 🇧🇷
Interests: Computational Social Science, Platforms, GenAI, Moderation
Reposted by Manoel Horta Ribeiro
The Center for Information Technology Policy at Princeton invites applications for a Postdoctoral Fellow to work with an interdisciplinary team (me, @bstewart.bsky.social, and @manoelhortaribeiro.bsky.social).
Link: puwebp.princeton.edu/AcadHire/app...
Please apply by THIS SUNDAY, Dec. 14!
Link: puwebp.princeton.edu/AcadHire/app...
Please apply by THIS SUNDAY, Dec. 14!
December 9, 2025 at 9:34 PM
The Center for Information Technology Policy at Princeton invites applications for a Postdoctoral Fellow to work with an interdisciplinary team (me, @bstewart.bsky.social, and @manoelhortaribeiro.bsky.social).
Link: puwebp.princeton.edu/AcadHire/app...
Please apply by THIS SUNDAY, Dec. 14!
Link: puwebp.princeton.edu/AcadHire/app...
Please apply by THIS SUNDAY, Dec. 14!
The Center for Information Technology Policy at Princeton invites applications for a Postdoctoral Fellow to work with Andy Guess (Politics/SPIA), Brandon Stewart (Sociology), and me (CS).
puwebp.princeton.edu/AcadHire/app...
Please apply before Sunday, the 13th of December!
puwebp.princeton.edu/AcadHire/app...
Please apply before Sunday, the 13th of December!
December 9, 2025 at 8:51 PM
The Center for Information Technology Policy at Princeton invites applications for a Postdoctoral Fellow to work with Andy Guess (Politics/SPIA), Brandon Stewart (Sociology), and me (CS).
puwebp.princeton.edu/AcadHire/app...
Please apply before Sunday, the 13th of December!
puwebp.princeton.edu/AcadHire/app...
Please apply before Sunday, the 13th of December!
Reposted by Manoel Horta Ribeiro
🚨 New in Nature+Science!🚨
AI chatbots can shift voter attitudes on candidates & policies, often by 10+pp
🔹Exps in US Canada Poland & UK
🔹More “facts”→more persuasion (not psych tricks)
🔹Increasing persuasiveness reduces "fact" accuracy
🔹Right-leaning bots=more inaccurate
AI chatbots can shift voter attitudes on candidates & policies, often by 10+pp
🔹Exps in US Canada Poland & UK
🔹More “facts”→more persuasion (not psych tricks)
🔹Increasing persuasiveness reduces "fact" accuracy
🔹Right-leaning bots=more inaccurate
December 4, 2025 at 8:43 PM
🚨 New in Nature+Science!🚨
AI chatbots can shift voter attitudes on candidates & policies, often by 10+pp
🔹Exps in US Canada Poland & UK
🔹More “facts”→more persuasion (not psych tricks)
🔹Increasing persuasiveness reduces "fact" accuracy
🔹Right-leaning bots=more inaccurate
AI chatbots can shift voter attitudes on candidates & policies, often by 10+pp
🔹Exps in US Canada Poland & UK
🔹More “facts”→more persuasion (not psych tricks)
🔹Increasing persuasiveness reduces "fact" accuracy
🔹Right-leaning bots=more inaccurate
Reposted by Manoel Horta Ribeiro
help spread the word about this campaign - or, if you're able, consider supporting yourself! Bonfire is building a modular toolkit for organizing, mutual aid, open science, and collective decision-making on the open social web. communities choose what gets built:
www.indiegogo.com/en/projects/...
www.indiegogo.com/en/projects/...
Bonfire: building blocks for communities on the open social web by Bonfire - Indiegogo
From platforms to communities: a federated social web with shared foundations and co‑created spaces for gathering, care, connection, and stewardship.
www.indiegogo.com
December 3, 2025 at 6:15 PM
help spread the word about this campaign - or, if you're able, consider supporting yourself! Bonfire is building a modular toolkit for organizing, mutual aid, open science, and collective decision-making on the open social web. communities choose what gets built:
www.indiegogo.com/en/projects/...
www.indiegogo.com/en/projects/...
Whoa, excellent study just dropped in Science!
"Reranking partisan animosity in algorithmic social media feeds alters affective polarization"
www.science.org/doi/10.1126/...
Led by @tiziano.bsky.social and @msaveski.bsky.social
"Reranking partisan animosity in algorithmic social media feeds alters affective polarization"
www.science.org/doi/10.1126/...
Led by @tiziano.bsky.social and @msaveski.bsky.social
Reranking partisan animosity in algorithmic social media feeds alters affective polarization
Today, social media platforms hold the sole power to study the effects of feed-ranking algorithms. We developed a platform-independent method that reranks participants’ feeds in real time and used thi...
www.science.org
November 30, 2025 at 1:04 AM
Whoa, excellent study just dropped in Science!
"Reranking partisan animosity in algorithmic social media feeds alters affective polarization"
www.science.org/doi/10.1126/...
Led by @tiziano.bsky.social and @msaveski.bsky.social
"Reranking partisan animosity in algorithmic social media feeds alters affective polarization"
www.science.org/doi/10.1126/...
Led by @tiziano.bsky.social and @msaveski.bsky.social
Come work with Homa!! She’s amazing!!
At OASIS Lab, #UCLA, we are accepting applications for a PhD student who is passionate about using computational modeling, big data, and HCI to advance digital safety, responsible AI, and the study of online information ecosystems.
tinyurl.com/phdopenningu...
#PhD #AIforGood #OnlineSafety
tinyurl.com/phdopenningu...
#PhD #AIforGood #OnlineSafety
LinkedIn
This link will take you to a page that’s not on LinkedIn
lnkd.in
November 25, 2025 at 10:55 PM
Come work with Homa!! She’s amazing!!
Reposted by Manoel Horta Ribeiro
Trying an experiment in good old-fashioned blogging about papers: dallascard.github.io/granular-mat...
Language Model Hacking - Granular Material
dallascard.github.io
November 16, 2025 at 7:51 PM
Trying an experiment in good old-fashioned blogging about papers: dallascard.github.io/granular-mat...
TikTok and the likes transformed how we spend time on our phones. But do they increase mobile use, or just reshuffle what we already do?
We find that adopting TikTok increases total mobile usage and shortens breaks from the phone.
Preprint: osf.io/preprints/so...
We find that adopting TikTok increases total mobile usage and shortens breaks from the phone.
Preprint: osf.io/preprints/so...
November 17, 2025 at 3:42 PM
TikTok and the likes transformed how we spend time on our phones. But do they increase mobile use, or just reshuffle what we already do?
We find that adopting TikTok increases total mobile usage and shortens breaks from the phone.
Preprint: osf.io/preprints/so...
We find that adopting TikTok increases total mobile usage and shortens breaks from the phone.
Preprint: osf.io/preprints/so...
Reposted by Manoel Horta Ribeiro
⚖️ Measuring Scalar Constructs in Social Science with LLMs
with rising (and established) stars in Computational Social Science
@haukelicht.bsky.social
@rupak-s.bsky.social
@patrickwu.bsky.social
@pranavgoel.bsky.social
@elliottash.bsky.social
@alexanderhoyle.bsky.social
arxiv.org/abs/2509.03116
with rising (and established) stars in Computational Social Science
@haukelicht.bsky.social
@rupak-s.bsky.social
@patrickwu.bsky.social
@pranavgoel.bsky.social
@elliottash.bsky.social
@alexanderhoyle.bsky.social
arxiv.org/abs/2509.03116
November 17, 2025 at 9:29 AM
⚖️ Measuring Scalar Constructs in Social Science with LLMs
with rising (and established) stars in Computational Social Science
@haukelicht.bsky.social
@rupak-s.bsky.social
@patrickwu.bsky.social
@pranavgoel.bsky.social
@elliottash.bsky.social
@alexanderhoyle.bsky.social
arxiv.org/abs/2509.03116
with rising (and established) stars in Computational Social Science
@haukelicht.bsky.social
@rupak-s.bsky.social
@patrickwu.bsky.social
@pranavgoel.bsky.social
@elliottash.bsky.social
@alexanderhoyle.bsky.social
arxiv.org/abs/2509.03116
Reposted by Manoel Horta Ribeiro
🚨 I'm recruiting PhD students in Computer Science at Johns Hopkins University for Fall 2026. If you're interested in AI, HCI, and designing better online platforms and experiences, apply to work with me!
More info: piccardi.me
More info: piccardi.me
November 13, 2025 at 3:52 PM
🚨 I'm recruiting PhD students in Computer Science at Johns Hopkins University for Fall 2026. If you're interested in AI, HCI, and designing better online platforms and experiences, apply to work with me!
More info: piccardi.me
More info: piccardi.me
Reposted by Manoel Horta Ribeiro
Have been waiting for this paper to come out ever since Hongyao told me about it -- more academics should be taking advantage of such open data to answer important questions
Coverage of the paper by @ellebeyoud.bsky.social of Bloomberg here (gift link):
www.bloomberg.com/news/article...
www.bloomberg.com/news/article...
November 7, 2025 at 1:45 PM
Have been waiting for this paper to come out ever since Hongyao told me about it -- more academics should be taking advantage of such open data to answer important questions
Reposted by Manoel Horta Ribeiro
There’s plenty of evidence for political bias in LLMs, but very few evals reflect realistic LLM use cases — which is where bias actually matters.
IssueBench, our attempt to fix this, is accepted at TACL, and I will be at #EMNLP2025 next week to talk about it!
New results 🧵
IssueBench, our attempt to fix this, is accepted at TACL, and I will be at #EMNLP2025 next week to talk about it!
New results 🧵
Are LLMs biased when they write about political issues?
We just released IssueBench – the largest, most realistic benchmark of its kind – to answer this question more robustly than ever before.
Long 🧵with spicy results 👇
We just released IssueBench – the largest, most realistic benchmark of its kind – to answer this question more robustly than ever before.
Long 🧵with spicy results 👇
October 29, 2025 at 4:12 PM
There’s plenty of evidence for political bias in LLMs, but very few evals reflect realistic LLM use cases — which is where bias actually matters.
IssueBench, our attempt to fix this, is accepted at TACL, and I will be at #EMNLP2025 next week to talk about it!
New results 🧵
IssueBench, our attempt to fix this, is accepted at TACL, and I will be at #EMNLP2025 next week to talk about it!
New results 🧵
The debate over “LLMs as annotators” feels familiar: excitement, backlash, and anxiety about bad science. My take in a new blogpost is that LLMs don’t break measurement; they expose how fragile it already was.
doomscrollingbabel.manoel.xyz/p/labeling-d...
doomscrollingbabel.manoel.xyz/p/labeling-d...
Labeling Data with Language Models: Trick or Treat?
Large language models are now labeling data for us.
doomscrollingbabel.manoel.xyz
October 25, 2025 at 6:29 PM
The debate over “LLMs as annotators” feels familiar: excitement, backlash, and anxiety about bad science. My take in a new blogpost is that LLMs don’t break measurement; they expose how fragile it already was.
doomscrollingbabel.manoel.xyz/p/labeling-d...
doomscrollingbabel.manoel.xyz/p/labeling-d...
Reposted by Manoel Horta Ribeiro
Graze is doing great work in supporting the entire ATProto Ecosystem, and their latest newsletter is a great illustration. Also featuring an interview with @sjgreenwood.bsky.social about Paper Skygest (bsky.app/profile/pape...)
We’ve started describing ATProto as the new standard gauge — a shared track that finally lets social apps move together instead of apart. Our latest Graze newsletter looks at what that means in practice (plus a great chat with @sjgreenwood.bsky.social ).
graze-newsletter.beehiiv.com/p/the-new-st...
graze-newsletter.beehiiv.com/p/the-new-st...
The new standard gauge
Graze is Bluesky. By You.
graze-newsletter.beehiiv.com
October 21, 2025 at 12:39 PM
Graze is doing great work in supporting the entire ATProto Ecosystem, and their latest newsletter is a great illustration. Also featuring an interview with @sjgreenwood.bsky.social about Paper Skygest (bsky.app/profile/pape...)
Reposted by Manoel Horta Ribeiro
Join us as postdoc at the Inequality Discourse Observatory at the University of Konstanz: stellen.uni-konstanz.de/jobposting/7...
We will do epic research between Linguistics and Computational Social Science at the Cluster of Politics of Inequality. Feel free to DM if you have any questions.
We will do epic research between Linguistics and Computational Social Science at the Cluster of Politics of Inequality. Feel free to DM if you have any questions.
One postdoctoral Research Position
Deadline: November 15th, 2025
stellen.uni-konstanz.de
October 13, 2025 at 3:06 PM
Join us as postdoc at the Inequality Discourse Observatory at the University of Konstanz: stellen.uni-konstanz.de/jobposting/7...
We will do epic research between Linguistics and Computational Social Science at the Cluster of Politics of Inequality. Feel free to DM if you have any questions.
We will do epic research between Linguistics and Computational Social Science at the Cluster of Politics of Inequality. Feel free to DM if you have any questions.
Computer Science is no longer just about building systems or proving theorems--it's about observation and experiments.
In my latest blog post, I argue it’s time we had our own "Econometrics," a discipline devoted to empirical rigor.
doomscrollingbabel.manoel.xyz/p/the-missin...
In my latest blog post, I argue it’s time we had our own "Econometrics," a discipline devoted to empirical rigor.
doomscrollingbabel.manoel.xyz/p/the-missin...
October 5, 2025 at 4:07 PM
Computer Science is no longer just about building systems or proving theorems--it's about observation and experiments.
In my latest blog post, I argue it’s time we had our own "Econometrics," a discipline devoted to empirical rigor.
doomscrollingbabel.manoel.xyz/p/the-missin...
In my latest blog post, I argue it’s time we had our own "Econometrics," a discipline devoted to empirical rigor.
doomscrollingbabel.manoel.xyz/p/the-missin...
Reposted by Manoel Horta Ribeiro
🌱✨ Life update: I just started my PhD at Princeton University!
I will be supervised by @manoelhortaribeiro.bsky.social and affiliated with Princeton CITP.
It's only been a month, but the energy feels amazing —very grateful for such a welcoming community. Excited for what’s ahead! 🚀
I will be supervised by @manoelhortaribeiro.bsky.social and affiliated with Princeton CITP.
It's only been a month, but the energy feels amazing —very grateful for such a welcoming community. Excited for what’s ahead! 🚀
October 3, 2025 at 5:56 PM
🌱✨ Life update: I just started my PhD at Princeton University!
I will be supervised by @manoelhortaribeiro.bsky.social and affiliated with Princeton CITP.
It's only been a month, but the energy feels amazing —very grateful for such a welcoming community. Excited for what’s ahead! 🚀
I will be supervised by @manoelhortaribeiro.bsky.social and affiliated with Princeton CITP.
It's only been a month, but the energy feels amazing —very grateful for such a welcoming community. Excited for what’s ahead! 🚀
Social media feeds today are optimized for engagement, often leading to misalignment between users' intentions and technology use.
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776
September 16, 2025 at 1:24 PM
Social media feeds today are optimized for engagement, often leading to misalignment between users' intentions and technology use.
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776
In a new paper, we introduce Bonsai, a tool to create feeds based on stated preferences, rather than predicted engagement.
arxiv.org/abs/2509.10776
I'm thinking a lot about the debate around whether LMs can "understand." Enter a new thought experiment I call "the lean Chinese room." IMO, it shows how the pressure of compression and speed blurs the line between symbol-shuffling and understanding.
doomscrollingbabel.manoel.xyz/p/the-lean-c...
doomscrollingbabel.manoel.xyz/p/the-lean-c...
August 25, 2025 at 4:30 PM
I'm thinking a lot about the debate around whether LMs can "understand." Enter a new thought experiment I call "the lean Chinese room." IMO, it shows how the pressure of compression and speed blurs the line between symbol-shuffling and understanding.
doomscrollingbabel.manoel.xyz/p/the-lean-c...
doomscrollingbabel.manoel.xyz/p/the-lean-c...
Whether or not AIs “truly” understand is less important than how they reshape jobs, politics, and culture.
My new post: why the “Human of the Gaps” fallacy distracts us from governing real-world AI impacts.
doomscrollingbabel.manoel.xyz/p/the-retrea...
My new post: why the “Human of the Gaps” fallacy distracts us from governing real-world AI impacts.
doomscrollingbabel.manoel.xyz/p/the-retrea...
August 17, 2025 at 2:58 PM
Whether or not AIs “truly” understand is less important than how they reshape jobs, politics, and culture.
My new post: why the “Human of the Gaps” fallacy distracts us from governing real-world AI impacts.
doomscrollingbabel.manoel.xyz/p/the-retrea...
My new post: why the “Human of the Gaps” fallacy distracts us from governing real-world AI impacts.
doomscrollingbabel.manoel.xyz/p/the-retrea...
Creators pour years into building a following, but in a growing underground market, you can simply buy accounts and inherit their audience.
In our new pre-print, we find this practice of repurposing accounts to be prevalent and consequential on YouTube!
arxiv.org/abs/2507.16045
In our new pre-print, we find this practice of repurposing accounts to be prevalent and consequential on YouTube!
arxiv.org/abs/2507.16045
July 30, 2025 at 8:29 PM
Creators pour years into building a following, but in a growing underground market, you can simply buy accounts and inherit their audience.
In our new pre-print, we find this practice of repurposing accounts to be prevalent and consequential on YouTube!
arxiv.org/abs/2507.16045
In our new pre-print, we find this practice of repurposing accounts to be prevalent and consequential on YouTube!
arxiv.org/abs/2507.16045
🚨 Study alert!
We've developed a prototype that enables you to create personalized social media feeds using natural language rules and import them into Bluesky.
Join our study to try out the tool, give us your feedback, and earn a $50 gift card!
Sign up: forms.gle/MkSGKzxDfBEc...
Please share :)
We've developed a prototype that enables you to create personalized social media feeds using natural language rules and import them into Bluesky.
Join our study to try out the tool, give us your feedback, and earn a $50 gift card!
Sign up: forms.gle/MkSGKzxDfBEc...
Please share :)
July 22, 2025 at 1:23 PM
🚨 Study alert!
We've developed a prototype that enables you to create personalized social media feeds using natural language rules and import them into Bluesky.
Join our study to try out the tool, give us your feedback, and earn a $50 gift card!
Sign up: forms.gle/MkSGKzxDfBEc...
Please share :)
We've developed a prototype that enables you to create personalized social media feeds using natural language rules and import them into Bluesky.
Join our study to try out the tool, give us your feedback, and earn a $50 gift card!
Sign up: forms.gle/MkSGKzxDfBEc...
Please share :)
In a new blogpost, I argue GenAI as is won't "eat social media," because of:
- authenticity
- user preferences
- platforms being able to handle content at scale
doomscrollingbabel.manoel.xyz/publish/post...
- authenticity
- user preferences
- platforms being able to handle content at scale
doomscrollingbabel.manoel.xyz/publish/post...
July 5, 2025 at 11:36 AM
In a new blogpost, I argue GenAI as is won't "eat social media," because of:
- authenticity
- user preferences
- platforms being able to handle content at scale
doomscrollingbabel.manoel.xyz/publish/post...
- authenticity
- user preferences
- platforms being able to handle content at scale
doomscrollingbabel.manoel.xyz/publish/post...
In a new blog post, I...
- show that AI-generated videos are quite expensive to create
- argue that even if they weren't, we still would not drown in it.
doomscrollingbabel.manoel.xyz/p/ai-generat...
- show that AI-generated videos are quite expensive to create
- argue that even if they weren't, we still would not drown in it.
doomscrollingbabel.manoel.xyz/p/ai-generat...
July 1, 2025 at 7:56 PM
In a new blog post, I...
- show that AI-generated videos are quite expensive to create
- argue that even if they weren't, we still would not drown in it.
doomscrollingbabel.manoel.xyz/p/ai-generat...
- show that AI-generated videos are quite expensive to create
- argue that even if they weren't, we still would not drown in it.
doomscrollingbabel.manoel.xyz/p/ai-generat...