Who produces hate speech? And how does that matter for content moderation?
We show that across different countries and platforms, a relatively small share of users are responsible for a very large share of hate - overall, 5% write 83-100% of hateful content.
www.cambridge.org/core/journal...
06.03.2026 13:21
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When you see "AI-generated" on Instagram, does it make you more skeptical β or more trusting of everything without a label?
New research from German Instagram users has answers for policymakers pushing for AI labeling laws.
Good news and a warningπ
25.02.2026 09:01
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Is online discourse getting worse?
To bring actual data to bear on this question, we launched the Public Discourse Indicator, a dashboard tracking online comments submitted to several major Swiss newspapers. Our aim here is twofold:
www.public-discourse.org/en/public-di...
17.02.2026 15:26
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π¨My first preprint is out on @socarxiv.bsky.social!
How do AI-generated content labels shape what people see as authentic on social media β and do labels have unintended side effects? osf.io/preprints/so...
A thread π§΅
12.02.2026 14:06
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Measuring Causal Impact of Online Actions via Natural Experiments | Proceedings of the 21th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining
I think this is unfair to front door, which I think has actual empirical potential. e.g. dl.acm.org/doi/10.1145/... // amstat.tandfonline.com/doi/abs/10.1... I think one problem is that it's less "design-based" in the sense of requiring more complicated identification stories.
01.01.2026 19:56
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Join us next week for the Brown Bag Seminar!
Weβre excited to host Professor @ddimmery.com for a discussion on how to design studies that preemptively address challenges, improving inference and generalization before data collection even begins.
Register π www.hertie-school.org/en/datascien...
13.11.2025 13:54
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The Experiments Section Newsletter is BACK! Latest issue just dropped: what do we actually do while conducting experiments, and how do we handle unexpected events?
07.03.2025 21:24
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The end of 538 is a huge shame - both for the incredible people who worked there, and for political and data journalism as a whole.
I was lucky enough to work beside them for a few years and want to say a bit about what I think was so valuable that I hope doesn't vanish from the media landscape: π§΅
06.03.2025 17:19
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What's the point of RCTs?
An ontological perspective
RCTs are good, but not (just) because they make the statistics easy.
13.02.2025 14:29
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Interested in how people talk to each other online? Care about causal inference and/or NLP? Want to design and implement field experiments?
Come do a PhD with Dominik Hangartner, me, and a bunch of awesome people at IPL in Zurich:
jobs.ethz.ch/job/view/JOP...
07.02.2025 12:47
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A thread about being wrong:
5 years ago, we wrote a paper about how how newly enfranchised 16-year-olds vote in Austria. But we were wrong.
This year, @elisabethgraf.bsky.social, @schnizzl.bsky.social, Sylvia Kritzinger and I are setting the record straight: authors.elsevier.com/c/1juT5xRaZk...
21.11.2024 18:00
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Welcome to Hertie, @ddimmery.com ! π€Β
The Professor of Data Science for the Common Good begins teaching today.
"Algorithms, code and machine learning are an increasingly large part of how our world works. I'm excited to empower students to understand these topics!"
@hertiedatascience.bsky.social
05.02.2024 12:10
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Examining the Apparatus
The purpose of a system is what it does
Using the reframing of "the Algorithm" to "the Apparatus" should shape how we evaluate what it is/does open.substack.com/pub/drewdimm...
30.01.2024 16:29
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Calibration as an HTE diagnostic
Paper just accepted to Information Systems Research
Continuing with the controversial takes, in this post I argue that folks should plot their data (based on a new paper at ISR with Yan Leng) open.substack.com/pub/drewdimm...
16.01.2024 16:16
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Thank you, this is still a nice suggestion!
07.11.2023 10:57
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Does anyone know of a good intellectual history of ML/AI? Something that doesn't just survey the development of methods, but includes things like "Papert and Minsky think solving computer vision will be an undergrad summer project in the 60s"
06.11.2023 13:20
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Your weird linear algebra fact of the day:
b_ols = (X'X)^{-1} X'y = X^+ y
where X^+ is the Moore-Penrose inverse and X'X is invertible.
22.10.2023 19:06
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Accelerationism is Terrorism
Accelerating change has become both addictive and intolerable.
Really nice post by Kevin about the (insane) techno-optimist manifesto. There's also an implicit meta-level critique about modes of thinking that's worth considering, too: the Manifesto was basically a tweet-thread; Kevin's post is not. open.substack.com/pub/kevinmun...
17.10.2023 20:41
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A Blueprint for the Regulation of Tech
Counterfactuals are the key to accurately assessing the risks of online platforms
My coauthor Drew Dimmery (formerly of Meta) on how the 2020 US Facebook and Instagram Election Project offers a template for reporting by social media platforms under future regulation - recommended
11.09.2023 18:45
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bwd
A clean implementation of the Balancing Walk Design for online experimental design from Arbour, Dimmery, Mai and Rao (2022)
I finally got around to posting a package to PyPi (https://pypi.org/project/bwd/). Geez, the comparison to the CRAN process is like night and day.
Zero worrying about a petty tyrant yelling at me for not following some abstruse and poorly documented procedures.
11.07.2023 15:36
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