Kleber Oliveira
@kleber-ao.com
250 followers 710 following 58 posts
Computational mathematician @unioflimerick.bsky.social. (Social) network dynamics and information spreading.
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kleber-ao.com
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
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...
arxiv.org
Reposted by Kleber Oliveira
meredithmeredith.bsky.social
📣 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.
Reposted by Kleber Oliveira
irisvanrooij.bsky.social
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-...
Open Letter: Stop the Uncritical Adoption of AI Technologies in Academia
openletter.earth
kleber-ao.com
"The order, aggravated by Trump's illegal attempt on intervening on Brazil's sovereign institutions, comes before..." -- there you go, corrected it for you in case you have any spine left and would call it as is
Reposted by Kleber Oliveira
metr.org
METR @metr.org · Jul 10
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.
Reposted by Kleber Oliveira
pkrugman.bsky.social
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...
Trump's Dictator Protection Program
Using tariffs to fight democracy
paulkrugman.substack.com
kleber-ao.com
This is awful... 🤦
kleber-ao.com
Funny thing, "there are many Brazilians on this platform" exactly because another platform refused to comply with the most basic things to operate in the country, such as having legal representation.

Maybe we wait and see on this one before announcing it's the death of social media?
Reposted by Kleber Oliveira
olufemiotaiwo.bsky.social
the Brazilian replies to this post will take you on a fucking journey
Reposted by Kleber Oliveira
abbasrizi.bsky.social
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
kleber-ao.com
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.
mikeq.bsky.social
We're offering two funded PhD studentships in the ERC-Funded ID-Compression project at the University of Limerick, Ireland -- please pass on to any kind, curious & talented candidates who might be interested. Thank you! @csi-research.bsky.social
www.dropbox.com/scl/fi/svvz1...
An image of a description for ID-COMPRESSION PhD Studentships 2025
Studentship 1: Social Sciences with an Interest in Social Identity
Studentship 2: Applied Maths/Stats/Computational Social Science

Full text PDF available at link
Reposted by Kleber Oliveira
justanormaldino.bsky.social
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]
kleber-ao.com
On top of leaning towards this with the usual networks + nonlinear dynamics toolkit (I suppose I will be able to call myself a computational social scientist at some stage?), we will deal with a good amount of information theory. Feel free to reach out if you are curious about the project's details!
kleber-ao.com
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).
kleber-ao.com
I am really glad I had the opportunity to work with co-authors who are so knowledgeable on the topic. Thanks very much @pietrotraversa.bsky.social @ymoreno.bsky.social and @guifarruda.bsky.social for the amazing work. Be sure to check the pre-print.
kleber-ao.com
Our comparison of the model against empirical data also provides additional evidence that real-world rumor propagation tends to occur near criticality, opening the door to a more detailed understanding of rumor dynamics in Higher-order systems. 4/5
kleber-ao.com
Interestingly, our analysis reveals continuous transitions in both homogeneous and heterogeneous hypergraphs, challenging the idea that higher-order interactions necessarily lead to discontinuous transitions. 3/5
kleber-ao.com
and then compare it with empirical rumour cascades reconstructed from Telegram and a dataset of e-mail threads. We show that the model has two distinct subcritical behaviors that can coexist. 2/5
kleber-ao.com
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
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...
arxiv.org
Reposted by Kleber Oliveira
Reposted by Kleber Oliveira
martonkarsai.bsky.social
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
Postdoctoral Researcher (f/m/d)
Postdoctoral Researcher (f/m/d)
careers.ceu.edu
kleber-ao.com
What does someone being "reliable" even mean?

Any verification label platforms had in the past before twitter's became a subscription plan was designed so that the platform vouches for a profile being operated by who they claim to be behind it.
kleber-ao.com
So the alternative to "not pay fairly" is to not pay at all...
kleber-ao.com
Nobody denies he's an important figure in our supreme court, but whatever they pass is backed by a majority of ministers.

While he is the face of many things done by the judiciary system, it's actually this institution preventing our country to derail like yours.