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Posts by Petter Holme

View over the canal in Nyhavn, Copenhagen

View over the canal in Nyhavn, Copenhagen

Thrilled to announce CS2Nordics: the First Nordic Conference on Computational Social Science. Copenhagen, September 21-22, 2026.

We invite all CSS researchers in the Nordics as well as in the international research community to submit 2-page abstracts by June 19: nosocss.org/conference.h....

4 days ago 51 27 0 0

Let's say it's a feedback loop then. Because [No moderation] -> [flood of bad preprints] -> [we need peer review to call it science] is the counterfactual that could have saved us.

Now we need pre-preprints to get work out without the delays/gatekeeping of moderation. It's too easy to be cynical. 🙄

1 week ago 1 0 0 0

I'm pretty sure it is the biggest factor. It has removed the simple argument that a manuscript becomes science after it has passed peer review. Now I read statements (about manuscripts in CVs) like "passed moderation at a prestigious preprint archive."

1 week ago 1 0 1 0

That moderation has turned preprints into publication-light is the upsetting thing in all of this. When preprinting was only about timestamping your results, it was immune to fake/mad/pseudo science. (Moderating against hate, racism, etc., is good tho.)

1 week ago 2 0 1 0
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Network of the day. From pin.it/4k3aQ9JZ0

1 week ago 9 1 1 0

Respectful indeed! Not like the discussion page for the colors of the Italian flag, which is a rabbit hole you will now descend into: commons.wikimedia.org/wiki/File_ta...

2 weeks ago 2 0 1 0
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Network of the day: A bunch of trees and their mycorrhizal links to illustrate (the later discredited) wood-wide-web hypothesis.
From: www.pinterest.com/pin/55415392...

2 weeks ago 17 2 3 1
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Network of the day: Scottish companies from John Scott's Social Network Analysis (1991).

2 weeks ago 7 0 1 0
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It's been five years since our Eurasian Summit for Models of Society. What a stellar line-up we had. 🤩

Ah, those were the days! The pandemic was on, and anything seemed possible (at least as far as Zoom conferences go).

3 weeks ago 2 1 0 0
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Network of the day: Japanese educational poster about the different materials and resources produced by / deriving from the forest industry.

4 weeks ago 14 3 1 0
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Superintelligence, collective stupidity, and the AI agents of the future First and foremost, James Evans and his colleagues are my greatest role models at the moment, and I can’t think of a better research plan than to follow in their footsteps. This blog post is …

A humble blog post about a recent Science essay by James Evans et al. What can we say about the future collective intelligence of AI agents today? 🤖
petterhol.me/2026/03/20/s...

1 month ago 16 2 3 1

Wasn't there a unique time window, maybe those born between 1870 and 1970, for whom youth culture became completely incomprehensible when they became middle-aged

I was totally expecting such a moment (e.g., kids listening to humpback whales), but no, it is just the same stuff repeating.

1 month ago 1 0 1 0
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Next up in our colloquium series: Guido Caldarelli, truly a network science pioneer, representing a European country famous, in addition to Prof. Caldarelli himself, for its exquisite cuisine and the two Nintendo brothers.

Register here: iu.zoom.us/webinar/regi...

1 month ago 6 1 0 0

Definitely! Monuments should be raised and streets renamed! 😉

1 month ago 1 1 0 0

Fun fact: It came out of a self-imposed homework in a reading group and took less than two weeks from idea to submitted paper.

Less fun fact: The distribution of triangles that it generates is different from real social networks, making HK networks more fragile than real ones.

1 month ago 3 1 0 0
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Over 30 years of Statistical and Nonlinear Physics in _Physical Review E_ APS Division of Statistical and Nonlinear Physics and <em>Physical Review E</em> review over 30 years of research in the division’s areas.

The Holme-Kim model got a paragraph in this piece about networks and nonlinear stuff in PRE over the years 🥳 journals.aps.org/over-30-years

1 month ago 10 2 1 1

Two postdoc positions open at SUMOC (Sorbonne Université | INSERM), Paris, within the EPIcx lab.

🦠 Network epidemiology of healthcare-associated infections (ARCANE)
🧠 Coupled behavior–disease modeling (PREVIX)

2-y positions | Start June 2026
#epidemiology #networks #matrices

1 month ago 9 13 1 1
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Bipartite network of the day: Metalloids and their compounds from Youmans' Chemical Atlas 1856.

1 month ago 5 2 0 0

Kalkonmallen

1 month ago 2 0 0 0
Community structure unveils the path multiplicity in complex networks - Nature Communications Recent studies on path multiplicity have shown strong heterogeneity in shortest paths between node pairs in real-world networks. Here, authors reveal that community structure is a key factor shaping p...

New paper out in Nature Communications: 🚨📄https://www.nature.com/articles/s41467-026-70369-4
We hope to bring some oldskool netsci vibes to the weekend, dusting off the understudied characteristic of shortest-path multiplicity.

1 month ago 10 1 0 0
Title page of the paper.

Title page of the paper.

🧵 New WP! w/ @selcanmutgan.bsky.social

Most segregation research examines neighborhoods, schools, or workplaces separately. But do individuals' exposure align across domains and persist over the life course? We fill this gap using 27 years of 🇸🇪 data.

Pre-print: osf.io/eunwc_v1 (1/5)

1 month ago 49 19 1 0
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Spring '26

one season follows another . . my mix-tape for the spring 2026. 90 minutes, to fit your BASF:
open.spotify.com/playlist/02n...

1 month ago 2 0 0 0

yes! I should read SAOB more, it would be cool to drop a phrase like "ymnig vedergällning i vänners tillgifvenhet" now and then :D

1 month ago 1 0 0 0

I only know "vedergällning" in the sense of "retaliation" . . it certainly looks like it means "compensation" here, but with the gun in the picture, I would be nervous to return the bag . .

Nice find!

1 month ago 1 0 1 0

Yes, that much I think we (Scandinavians) even learned in school. 😊 But I'm curious what defines the other edges (in the background)? @abbasrizi.bsky.social told me some, but not all, are bloodlines. Do you see any pattern in the selection of nodes and edges?

1 month ago 0 0 0 0
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Network of the day:
Turkish 16th-century miniature showing the Prophet Muhammad, the Rashidun Caliphs, and people related to them in various ways.

From commons.wikimedia.org/wiki/File:Tu... Shout out to
@abbasrizi.bsky.social for clarifications

1 month ago 6 2 2 0
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The 8th European Conference on Social Networks (EUSN 2026) The 8th European Conference on Social Networks (EUSN 2026) will take place on 11–15 August 2026 in Norrköping, Sweden, hosted by the Institute for Analytical Sociology (IAS), Linköping University. The...

Are you a social network researcher using mixed methods?

We invite you to contribute to the "Mixed Methods for Social Network Analysis" session at EUSN2026, co-organised with @franciscaortizruiz.bsky.social & @mirandalubbers.bsky.social

Apply by 1 March liu.se/en/event/eus...

See you in Sweden!

1 month ago 12 11 1 1
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Network of the day: The piping of an Iraqi refinery.

From dame.exeter.ac.uk/en/home/

1 month ago 4 0 0 0
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The Song of the Banyan Tree
@jasonsinghthing, the Mozart (or maybe Brian Eno) of Biosonfication, attaches electrodes to our banyan tree to record its biofeedback and turn into a soundtrack for Tishani Doshi to dance to @oliviafraserart's British Council show, A Journey Within, opening Thursday

2 months ago 47 15 2 0
TENET@NetSci2026

🚨Deadline extension🚨

If you’re interested in Temporal Networks, don’t miss the chance to submit your work to the TENET satellite @netsciconf.bsky.social in Boston!
📅 New deadline: 2 March
📝 Submit two page abstract

More info here: tinyurl.com/4zevnyft

2 months ago 2 4 0 0