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Kleber Oliveira

@kleber-ao.com
256 followers 722 following 58 posts

Computational mathematician @unioflimerick.bsky.social. (Social) network dynamics and information spreading.

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Reposted by Kleber Oliveira
PNAS Nexus @pnasnexus.org · 27/01/2026
Social media sites can bring people together or push them further apart. A modeling study shows how small changes in posting or recommendation rules can flip a system from consensus to polarization. In PNAS Nexus: ow.ly/hLrY50Y3KPk
New system states introduced with the parameter μ. The same parameterization except for different innovation probability μ can lead to consensus in a homogeneous topology or two polarized communities. On the left, the innovation probability μ = 1. On the right, μ = 0.1.
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Henrique F. de Arruda @hfarruda.bsky.social · 23/01/2026
We link virality and polarization. An ABM calibrated on Brexit and Vaccine debates shows the same parameters that generate cascades also generate polarized opinions. Thanks to @ymoreno.bsky.social and @kleber-ao.com academic.oup.com/pnasnexus/ar...
academic.oup.com
Mechanistic interplay between information spreading and opinion polarization
Abstract. We investigate how information-spreading mechanisms affect opinion dynamics and vice versa via an agent-based simulation on adaptive social netwo
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Henrique F. de Arruda @hfarruda.bsky.social · 23/01/2026
Para quienes habláis español: si queréis saber más sobre la polarización y la difusión de información en redes sociales, aquí tenéis una nota de prensa sobre nuestro estudio reciente. www.unizar.es/actualidad/v... @ymoreno.bsky.social and @kleber-ao.com www.unizar.es/actualidad/v...
unizar.es
Un estudio del BIFI-UNIZAR arroja nuevos datos sobre el fenómeno de polarización en redes sociales online
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Alex Mesoudi @alexmesoudi.com · 14/11/2025
Come and do a PhD at Exeter with me and Chico Camargo (Computer Science) on human-genAI coevolution "Leveraging Natural Language Processing for Data-Driven Agent-Based Modelling of Online Cultural Dynamics" www.exeter.ac.uk/v8media/recr... More details here: www.exeter.ac.uk/study/fundin...
exeter.ac.uk
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Nicholas Landry @nwlandry.bsky.social · 25/11/2025
One week left to apply to the UVA Biology PhD program! If you or someone you know are interested in contagion from a complex systems perspective, please reach out! I'm looking for a grad student! bio.as.virginia.edu/how-apply-gr...
bio.as.virginia.edu
How to Apply to the Graduate Program
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Anthony Moser @anthonymoser.com · 23/11/2025
I think the shortest version of why LLMs are an anti education technology is that education is fundamentally about making shared context to understand ourselves, each other, and the world And by design LLMs destroy shared context
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Kai Kupferschmidt @kakape.bsky.social · 29/10/2025
"Access to data by researchers is a crucial element of ensuring transparency and democratic accountability,” @lewan.bsky.social says. “The public is entitled to know what platforms and their algorithms are doing to the information landscape.” I wrote for @science.org about Meta, TikTok and the DSA 🧪
science.org
Meta and TikTok are obstructing researchers’ access to data, European Commission rules
Data are needed to study how social media spreads misinformation and influences elections, scientists say
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Petter Holme @pholme.bsky.social · 20/10/2025
arXiv alert! 📄🚨 A review paper about the physics of news, rumors, and opinions arxiv.org/abs/2510.15053 w @manlius.bsky.social @sarawalk.bsky.social Guido Cadarelli et al.
arxiv.org
The Physics of News, Rumors, and Opinions
The boundaries between physical and social networks have narrowed with the advent of the Internet and its pervasive platforms. This has given rise to a complex adaptive information ecosystem where ind...
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Meredith Whittaker @meredithmeredith.bsky.social · 09/09/2025
📣 NEW -- In The Economist, discussing the privacy perils of AI agents and what AI companies and operating systems need to do--NOW--to protect Signal and much else! www.economist.com/by-invitatio...
An illustration of me, and the headline: "AI agents are coming for your privacy, warns Meredith Whittaker
The Signal Foundation’s president worries they will also blunt competition and undermine cyber-security"To put it bluntly, the path currently being taken towards agentic AI leads to an elimination of privacy and security at the application layer. It will not be possible for apps like Signal—the messaging app whose foundation I run—to continue to provide strong privacy guarantees, built on robust and openly validated encryption, if device-makers and OS developers insist on puncturing the metaphoric blood-brain barrier between apps and the OS. Feeding your sensitive Signal messages into an undifferentiated data slurry connected to cloud servers in service of their AI-agent aspirations is a dangerous abdication of responsibility.Happily, it’s not too late. There is much that can still be done, particularly when it comes to protecting the sanctity of private data. What’s needed is a fundamental shift in how we approach the development and deployment of AI agents. First, privacy must be the default, and control must remain in the hands of application developers exercising agency on behalf of their users. Developers need the ability to designate applications as “sensitive” and mark them as off-limits to agents, at the OS level and otherwise. This cannot be a convoluted workaround buried in settings; it must be a straightforward, well-documented mechanism (similar to Global Privacy Control) that blocks an agent from accessing our data or taking actions within an app.

Second, radical transparency must be the norm. Vague assurances and marketing-speak are no longer acceptable. OS vendors have an obligation to be clear and precise about their architecture and what data their AI agents are accessing, how it is being used and the measures in place to protect it.
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Iris van Rooij 💭 @irisvanrooij.bsky.social · 26/07/2025
Uncritical adoption of AI “undermines our basic pedagogical values and principles of scientific integrity. It prevents us from maintaining our standards of independence & transparency. And most concerning, AI use … hinder[s] learning and deskill critical thought.” openletter.earth/open-letter-...
openletter.earth
Open Letter: Stop the Uncritical Adoption of AI Technologies in Academia
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METR @metr.org · 10/07/2025
We ran a randomized controlled trial to see how much AI coding tools speed up experienced open-source developers. The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.
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Paul Krugman @pkrugman.bsky.social · 10/07/2025
With everything else going on, I'm not sure people realize that Trump's latest tariff on Brazil took things to a new (lower) level paulkrugman.substack.com/p/trumps-dic...
paulkrugman.substack.com
Trump's Dictator Protection Program
Using tariffs to fight democracy
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Olúfẹ́mi O. Táíwò @olufemiotaiwo.bsky.social · 08/06/2025
the Brazilian replies to this post will take you on a fucking journey
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Abbas K. Rizi @abbasrizi.bsky.social · 05/06/2025
If you're looking for a quite handy multitype branching process framework for modeling diffusion in networks with communities check this work by @davidjpos.bsky.social and friends. @netsciconf.bsky.social #netsci2025
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Kleber Oliveira @kleber-ao.com · 05/06/2025
Fully-funded PhD positions to work with a fantastic team (and me 🫠) in a beautiful campus. Please share it with people who may be interested! Deadline on the 10th of July.
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Dino Carpentras @justanormaldino.bsky.social · 13/05/2025
We often suppose that things like intelligence and opinions not only exist, but can be measured in a “correct” way. So our goal is to reduce the error as much as possible to get closer and closer to such “correct” measurement. [1/7]
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Kleber Oliveira @kleber-ao.com · 12/05/2025
Glad to share that next month I am joining @mikeq.bsky.social's group on a full-time research position in my alma mater. I've been studying social systems for some time, but never from the theoretical foundations of how people act towards each other (which are from social psychology).
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Stephan Lewandowsky @lewan.uk · 01/05/2025
Good piece in Science by @kakape.bsky.social on the massive censorship of scientific work by the U.S. government - all in the name of free speech, presumably: www.science.org/content/arti...
science.org
Trump’s team, often accused of spreading misinformation, slashes misinformation research
Hundreds of grants axed in a field where the United States was a global leader
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Kleber Oliveira @kleber-ao.com · 29/04/2025
Now out: "Rumor propagation on hypergraphs" (arxiv.org/abs/2504.19305). We propose a higher-order rumour model incorporating a group-based annihilation mechanism. We run computational experiments to characterise the model's dynamics in synthetic and real systems... 1/5
arxiv.org
Rumor propagation on hypergraphs
The rapid spread of information and rumors through social media platforms, especially in group settings, motivates the need for more sophisticated models of rumor propagation. Traditional pairwise mod...
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Randall Munroe @xkcd.com · 25/04/2025
PhD Timeline xkcd.com/3081
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Márton Karsai @martonkarsai.bsky.social · 23/04/2025
Are you interested in inequalities, mobility and cities? Come to work with us as a postdoc at @ceu-dnds.bsky.social in Vienna in the Computational Human Dynamics Lab of @martonkarsai.bsky.social. Check the post here: careers.ceu.edu/job/Vienna-P... @ic2s2.bsky.social @netscisociety.bsky.social
careers.ceu.edu
Postdoctoral Researcher (f/m/d)
Postdoctoral Researcher (f/m/d)
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Alyssa Smith @cetaceanneeded.bsky.social · 01/04/2025
If you study networks, or have been stuck listening to people who study networks for long enough (sorry to my loved ones), you may have heard that open triads – V shapes – in social networks tend to turn into closed triangles. But why does this happen? In part, because people repost each other.
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Kleber Oliveira @kleber-ao.com · 02/04/2025
We've a new software paper out, check it below:
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Dino Carpentras @justanormaldino.bsky.social · 25/03/2025
🚨 New paper 🚨 Can big data solve all our measurement problems? Measuring constructs like opinions, happiness, etc. is problematic as it depends on various choices, including the choice of variables and model. [1/4] pressto.amu.edu.pl/index.php/sr...
pressto.amu.edu.pl
The hidden problem in Big Data: even infinite information does not guarantee consistent measurement | Society Register
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Marco Mancastroppa @marco-mancastroppa.bsky.social · 25/03/2025
Now out our new preprint “Higher-order dissimilarity measures for hypergraph comparison”! www.arxiv.org/abs/2503.16959 With Cosimo Agostinelli and @alainbarrat.bsky.social We extend to hypergraphs similarity measures defined previously only on pairwise networks. 🧵⬇️ 1/5
arxiv.org
Higher-order dissimilarity measures for hypergraph comparison
In recent years, networks with higher-order interactions have emerged as a powerful tool to model complex systems. Comparing these higher-order systems remains however a challenge. Traditional similar...
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Márton Karsai @martonkarsai.bsky.social · 19/03/2025
Open postdoc position at @ceu-dnds.bsky.social in Vienna in the Computational Human Dynamics Lab of @martonkarsai.bsky.social on inequalities in 15-minutes cities in collaboration with www.dut-coline.org. Check it out: careers.ceu.edu/job/Vienna-P... @ic2s2.bsky.social @netscisociety.bsky.social
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Philipp Lorenz-Spreen @lorenzspreen.eurosky.social · 08/03/2025
I wanted to highlight key findings from our study and the replication, and how they extend to 2024. Now it provides a systematic review of more than 600 scientific studies on the relationship between digitalization and democracy. So what does science have to say? We actually know quite a bit: 1/5
nature.com
A systematic review of worldwide causal and correlational evidence on digital media and democracy - Nature Human Behaviour
This systematic review on digital media and democracy finds beneficial relationships mostly in emerging democracies but detrimental associations in established democracies for different political vari...
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Kleber Oliveira @kleber-ao.com · 06/03/2025
The publisher may have failed to bottle up their intrusive thoughts
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Tech Policy Press @techpolicypress.bsky.social · 04/03/2025
If we allow technofeudal lords to dictate the rules, corporate interests will override national sovereignty and political accountability, and ultimately democracy, writes David Nemer. Brazil is a case study.
buff.ly
Threats to Democracy in Brazil: The Rise of Technofeudalism and the Assault on Democratic Institutions | TechPolicy.Press
If we allow technofeudal lords to dictate the rules, corporate interests will override national sovereignty and political accountability, writes David Nemer.
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The Atlantic @theatlantic.com · 23/02/2025
"Brazil has demonstrated how democracies that value themselves defend themselves," Quico Toro writes. "America could have done the same."
theatlantic.com
Brazil Stood Up for Its Democracy. Why Didn’t the U.S.?
Jair Bolsonaro was made to answer for trying to overturn an election.
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Mark Hamill @markhamillofficial.bsky.social · 22/02/2025
Worst. Episode. EVER.
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Kleber Oliveira @kleber-ao.com · 20/02/2025
Whenever I hear or read "far right", I think it's such a heartwarming/welcoming way to call it. Like it's another possible "point of view" in a debate instead of a group actively trying to shut down the whole conversation. How about "extreme right" or "radical right"?
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Hanlin Sun @hanlinsun.bsky.social · 19/02/2025
Happy to see our perspective article "Topology shapes dynamics on higher-order networks" is finally published in Nature Physics! rdcu.be/eauyN
rdcu.be
Topology shapes dynamics of higher-order networks
Nature Physics - Higher-order interactions reveal new aspects of the interplay between topology and dynamics in complex systems. This Perspective describes the emerging field of higher-order...
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Jeff Greene @jeffgreene.bsky.social · 10/02/2025
Pretty darn rigorous study of "inattention contagion" showing that students are influenced by nearby peers who display inattentive behavior, affecting their self-perceptions of attentiveness, their note-taking quantity, & their quiz performance. buff.ly/4hwvnhb
Screenshot of title page for article titled "Investigating Attention Contagion Between Students in a Lecture Hall" in the journal named Scholarship of Teaching and Learning in Psychology.
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Andreia Sofia Teixeira @asteixeira.bsky.social · 27/01/2025
I’m looking for a new PhD student with a curious and interdisciplinary mindset to work on integrating multimodal data to better understand trajectories of mental and brain health disorders! Deadline of applications: Feb 16! Please spread the word. www.jobs.ac.uk/job/DLO680/f...
jobs.ac.uk
Fully Funded PhD Scholarship in Network Science at Northeastern University London
Start your UK & international job search for academic jobs, research jobs, science jobs and managerial jobs in leading universities and top...
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SMBC comic Bot @smbc-bot.bsky.social · 15/01/2025
Saturday Morning Breakfast Cereal - Applied www.smbc-comics.com/comic/applied "You are all impure now!"
You are all impure now!
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Thulani Makhalanyane @thuls.bsky.social · 10/12/2024
Thinking of colleagues in Argentina. Sad to read this. www.nature.com/articles/d41...
nature.com
‘There will be nothing left’: researchers fear collapse of science in Argentina
One year into President Javier Milei’s presidency, scientists are exiting the country in the face of big budget cuts.
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Carl T. Bergstrom @carlbergstrom.com · 18/11/2024
I would have to spend a lot more time with the methods of this paper to know what to make of it, but the conclusion they draw is amusing. Giving people awards for peer reviewing lots of papers leads them to review fewer papers. www.nature.com/articles/s41...
nature.com
Can peer review accolade awards motivate reviewers? A large-scale quasi-natural experiment - Humanities and Social Sciences Communications
Humanities and Social Sciences Communications - Can peer review accolade awards motivate reviewers? A large-scale quasi-natural experiment
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Ian Boudreau @ianboudreau.com · 04/12/2024
Problem with referring to AI errors as "hallucinations" is that it makes them seem like something abnormal when in fact it's the exact same process it uses to produce every response
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Rebecca Sear @rebeccasear.bsky.social · 03/12/2024
Researchers are willing to trade their results for journal prestige: results from a discrete choice experiment metaror.org/kotahi/artic...
metaror.org
Researchers are willing to trade their results for journal prestige: results from a discrete choice experiment
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Kleber Oliveira @kleber-ao.com · 29/11/2024
Delighted to see our work (which I co-authored with @hfarruda.bsky.social and @ymoreno.bsky.social) getting additional media coverage, this time right ahead of Irish elections. www.breakingnews.ie/general-elec...
breakingnews.ie
How X's paid verification has created echo chambers and divisive content ahead of general election | BreakingNews.ie
Verification on Twitter used to be a sign of legitimacy, but since Elon Musk purchased the site, now X, anyone can purchase it
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William J. Brady @williambrady.bsky.social · 28/11/2024
New paper out in @ScienceMagazine! In 8 studies (multiple platforms, methods, time periods) we find: misinformation evokes more outrage than trustworthy news, when it does it's shared more + ppl are less likely to read before sharing. w/ @killianmcl1 @Klonick @mollycrockett 🧵👇
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Dare Obasanjo @carnage4life.bsky.social · 27/11/2024
When I asked Bluesky users why they left X, many said they didn’t want their posts training AI. But with Bluesky’s open API, anyone can scrape posts for that purpose. A HuggingFace employee just shared a dataset of 1M posts. The reality: if you post online, assume it’ll be used to train AI.
404media.co
Someone Made a Dataset of One Million Bluesky Posts for 'Machine Learning Research'
A Hugging Face employee made a huge dataset of Bluesky posts, and it’s already very popular.
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Tom Phillips @tomphillips.bsky.social · 26/11/2024
“The report about the alleged plot to help the right-wing populist Jair Bolsonaro cling to power paints a chilling portrait of how close one of the world’s largest democracies came to being plunged back into authoritarian rule.”
theguardian.com
Brazil almost suffered far-right military coup, police report claims
Senior military figures backed plot to seize power after Bolsonaro’s 2022 election defeat, federal documents allege
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Joana G Sa @joanagsa.bsky.social · 15/11/2024
We are hiring! If you are a #Psychology #Sociology #Neuro student, BSc or MSc level, and care about the role of human biases in the spread of #disinformation please consider applying (Lisbon based) If you are not but happen to know who is, do share euraxess.ec.europa.eu/jobs/287003 @spac.bsky.social
euraxess.ec.europa.eu
Research Fellowship (BI – Bachelor) - SPAC Group
The Laboratory of Instrumentation and Experimental Particle Physics (LIP) is opening a selection tender for one Research Student Fellowship (BI – Bachelor) for research activities in the scientific su...
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Carl T. Bergstrom @carlbergstrom.com · 22/11/2024
When I was 5, I loved science, which I took to be planets and magnets and chemicals and shit. Soon I realized science was a collective human activity, and these were just the objects of its attention. Anyway, whenever I read an OpEd on how science isn't political, I think "Are you 5 years old?"
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Maria del Rio-Chanona @maria-drc.bsky.social · 20/11/2024
🚨Funded PhD position at UCL Computer Science! 🌍💻 Learn how to use and develop LLMs, RL, Networks, and Agent-Based Models to forecast the impact of #AI in society and pathways towards a #net-zero economy. 👉 www.findaphd.com/phds/project... #MachineLearning #ComplexSystems #GreenTransition #PhD
findaphd.com
Agent-Based and Machine Learning Models for understanding the Economic Impacts of AI and/or the Green Transition at University College London on FindAPhD.com
PhD Project - Agent-Based and Machine Learning Models for understanding the Economic Impacts of AI and/or the Green Transition at University College London, listed on FindAPhD.com
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Carl T. Bergstrom @carlbergstrom.com · 11/11/2024
My twitter account has been closed and locked since November 2022, but I had left the posts up until now. I just deleted the entire thing in 15 minutes, thanks to a great script from Luca Hammer: github.com/lucahammer/t... Thanks to @amyhoy.bsky.social and @thomasfuchs.at for steering me there.
github.com
GitHub - lucahammer/tweetXer: Delete all your Tweets for free
Delete all your Tweets for free. Contribute to lucahammer/tweetXer development by creating an account on GitHub.
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