Pluralistic: The online community trilemma (16 Feb 2026)

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Originally published at: Pluralistic: The online community trilemma (16 Feb 2026) – Pluralistic: Daily links from Cory Doctorow



Today's links

  • The online community trilemma: Reach, community and information, pick two.
  • Hey look at this: Delights to delectate.
  • Object permanence: Bruces x Sony DRM; Eniac tell-all; HBO v PVRs; Fucking damselflies; Gil Scout Cookie wine-pairings; Big Pharma's opioid fines are tax-deductible; Haunted Mansion ops manual; RIAA v CD ripping; Flying boat; Morbid Valentines; Veg skulls; Billionaires x VR v guillotines; "Lovecraft Country"; Claude Shannon on AI; Comics Code Authority horror comic; Scratch-built clock; Stolen hospital.
  • Upcoming appearances: Where to find me.
  • Recent appearances: Where I've been.
  • Latest books: You keep readin' em, I'll keep writin' 'em.
  • Upcoming books: Like I said, I'll keep writin' 'em.
  • Colophon: All the rest.


An early 20th century photo of a mixed-gender group of people drinking in a working-class bar; with a smiling woman in the center. It has been altered: a nova-haloed thought bubble coming from the center woman's head reveals that she is daydreaming of a salon in which three upper class women in flapper-era outfits are chattering. A Prince Albert ad in the background has had the Reddit robot mascot matted into it.

The online community trilemma (permalink)

The digital humanities are one of the true delights of this era. Anthropologists are counting things like sociologists, sociologists are grappling with qualitative data like ethnographers, computational linguists are scraping and making sense of vast corpora of informal speech:

https://memex.craphound.com/2019/07/24/because-internet-the-new-linguistics-of-informal-english/

I follow a bunch of these digital humanities types: danah boyd, of course, but also Benjamin "Mako" Hill, whose work on the true meaning of the "free software"/"open source" debate is one of my daily touchpoints for making sense of the world we live in:

https://www.youtube.com/watch?v=vBknF2yUZZ8

Mako just published a new ACM HCI paper co-authored with his U Washington colleagues Nathan TeBlunthuis, Charles Kiene, Isabella Brown, and Laura Levi, "No Community Can Do Everything: Why People Participate in Similar Online Communities":

https://dl.acm.org/doi/epdf/10.1145/3512908

The paper is a great example of this quantitative ethnography/qualitative statistical analysis hybrid. The authors are trying to figure out why there are so many similar, overlapping online communities, particularly on platforms like Reddit. Why would r/bouldering, r/climbharder, r/climbing, and r/climbingcirclejerk all emerge?

This is a really old question/debate in online community design. The original internet community space, Usenet, was founded on strict hierarchical principles, using a taxonomy to produce a single canonical group for every kind of discussion. Sure, there was specialization (rec.pets.cats begat rec.pets.cats.siamese), but by design, there weren't supposed to be competing groups laying claim to the same turf, and indeed, unwary Usenet users were often scolded for misfiling their comments in the wrong newsgroup.

The first major Usenet schism arose out of this tension: the alt. hierarchy. Though alt. later became known for warez, porn, and other subjects that were banned by Usenet's founding "backbone cabal," the inciting incident that sparked alt.'s creation was a fight over whether "gourmand" should be classified as "rec.gourmand" or "talk.gourmand":

https://www.eff.org/deeplinks/2019/11/altinteroperabilityadversarial

Community managers design their services with strongly held beliefs about the features that make a community good. These beliefs, grounded in designers' personal experience, are assumed to be global and universal. Generally, this assumption is wrong, something that is only revealed later when more people arrive with different needs.

Think of Friendster's "fakester" problem, driven by its designers' beliefs about how people should organize their affinities:

https://www.zephoria.org/thoughts/archives/2003/08/17/the_fakester_manifesto.html

Or Mastodon's initial, self-limiting ban on "quote" posts as a way to encourage civility:

https://blog.joinmastodon.org/2025/02/bringing-quote-posts-to-mastodon/

And, as the paper's authors note, Stack Overflow has a strict prohibition on overlapping new communities, echoing Usenet's original design dispute.

On its face, this hierarchical principle for conversational spaces makes sense. Viewed through a naive economic lens of "reputation capital," having one place where all the people interested in your subject can be reached is optimal. The more people there are in a group, the greater the maximum "engagement" – likes, comments, reposts. If you're thinking about communities from an informational perspective, it's easy to assume that bigger groups are better, too: the more users there are in a topical group, the greater the likelihood that a user who knows the answer to your question will show up when you ask it.

But this isn't how online communities work. On every platform, and across platforms, overlapping, "redundant" groups emerge quickly and stick around over long timescales. Why is this?

That's the question the paper seeks to answer. The authors used data-analysis techniques to identify overlapping clusters of Reddit communities and then conducted lengthy, qualitative interviews with participants to discover why and how users participated in some or all of these seemingly redundant groups.

They conclude that there's a community-member's "trilemma": a set of three priorities that can never be fully satisfied by any group. The trilemma consists of users' need to find:

a) A community of like-minded people;

b) Useful information; and

c) The largest possible audience.

The thing that puts the "lemma" in this "trilemma" is that any given group can only satisfy two of these three needs. It's hard to establish the kinds of intimate, high-trust bonds with the members of a giant, high-traffic group, but your small, chummy circle of pals might not be big enough to include people who have the information you're seeking. Users can't get everything they need from any one group, so they join multiple groups that prioritize different paired corners of this people-information-scale triangle.

The interview excerpts put some very interesting meat on these analytical bones. For example, economists typically believe that online marketplaces rely on scale. Think of eBay: as the number of potential bidders increases, the likelihood that one will outbid another goes up. That drives more sellers to the platform, seeking the best price for their wares, which increases the diversity of offerings on eBay, bringing in more buyers.

But the authors discuss a community where vintage vinyl records are bought and sold that benefits from being smaller, because the members all know each other well enough to have a mutually trusting environment that makes transactions far more reliable. Actually knowing someone – and understanding that they don't want to be expelled from the community you both belong to – makes for a better selling and buying experience than consulting their eBay reputation score. The fact that buyers don't have as many sellers and sellers don't have as many buyers is trumped by the human connection in a community of just the right size.

That's another theme that arises in the paper: a "just right" size for a community. As one interviewee says:

I think there’s this weird bell curve where the community needs to be big enough where people want to post content. But it can’t get too big where people are drowning each other out for attention.

This explains why groups sometimes schism: they've gone from being "just big enough" to being "too big" for the needs they filled for some users. But another reason for schism is the desire by some members to operate with different conversational norms. Many of Reddit's topical clusters include a group with the "jerk" suffix (like r/climbingcirclejerk), where aggressive and dramatic forms of discourse that might intimidate newcomers are welcome. Newbies go to the main group, while "crusties" talk shit in the -jerk group. The authors liken this to "regulatory arbitrage" – community members seeking spaces with rules that are favorable to their needs.

And of course, there's the original source of community schism: specialization, the force that turns rec.pets.cats into rec.pets.cats.siamese, rec.pets.cats.mainecoons, etc. Though the authors don't discuss it, this kind of specialization is something that recommendation algorithms are really good at generating. At its best, this algorithmic specialization is a great way to discover new communities that enrich your life; at its worst, we call this "radicalization."

I devote a chapter of my 2023 book The Internet Con, "What about Algorithmic Radicalization?" to exploring this phenomenon:

https://www.versobooks.com/en-gb/products/3035-the-internet-con

The question I grapple with there is whether "engagement-maximizing" algorithms shape our interests, or whether they help us discover our interests. Here's the thought-experiment I propose: imagine you've spent the day shopping for kitchen cabinets and you're curious about the specialized carpentry that's used to build them. You go home and do a search that leads you to a video called "How All-­Wood Cabinets Are Made."

The video is interesting, but even more interesting is the fact that the creator uses the word "joinery" to describe the processes the video illustrates. So now you do a search for "joinery" and find yourself watching a wordless, eight-minute video about Japanese joinery, a thing you never even knew existed. The title of the video contains the transliterated Japanese phrase "Kane Tsugi," which refers to a "three-­way pinned corner miter" joint. Even better, the video description contains the Japanese characters: "面代留め差しほぞ接ぎ."

So now you're searching for "面代留め差しほぞ接ぎ" and boy are there a lot of interesting results. One of them is an NHK documentary about Sashimoto woodworking, which is the school that Kane Tsugi belongs to. Another joint from Sashimoto joinery is a kind of tongue-and-groove called "hashibame," but that comes up blank on Youtube.

However, searching on that term brings you to a bunch of message boards where Japanese carpenters are discussing hashibame, and Google Translate lets you dig into this, and before you know it, you've become something of an expert on this one form of Japanese joinery. In just a few steps, you've gone from knowing nothing about cabinetry to having a specific, esoteric favorite kind of Japanese joint that you're seriously obsessed with.

If this subject was political rather than practical, we'd call this process "radicalization," and we'd call the outcome – you sorting yourself into a narrow niche interest, to the exclusion of others – "polarization."

But if we confine our examples to things like literature, TV shows, flowers, or glassware, this phenomenon is viewed as benign. No one accuses an algorithm of brainwashing you into being obsessed with hashibame tongue-and-groove corners. We treat your algorithm-aided traversal of carpentry techniques as one of discovery, not persuasion. You've discovered something about the world – and about yourself.

Which brings me back to that original, Usenet-era schism over "redundant" groups. The person who wants to talk about being a "gourmand" in the "rec." hierarchy wants to participate in a specific set of conversational norms that are different from those in the "rec." hierarchy. Their interest isn't just being a "gourmand," it's in being a "rec.gourmand," something that is qualitatively different from being a "talk.gourmand."

The conversational trilemma – the unresolvable need for scale, trust and information – has been with us since the earliest days of online socializing. It's lovely to have it formalized in such a crisp, sprightly work of scholarship.

Hey look at this (permalink)


A shelf of leatherbound history books with a gilt-stamped series title, 'The World's Famous Events.'

Object permanence (permalink)

#25yrsago O'Reilly P2P Conference https://web.archive.org/web/20010401001205/https://www.wired.com/news/technology/0,1282,41850,00.html

#20yrsago Sony DRM Debacle roundup Part VI https://memex.craphound.com/2006/02/14/sony-drm-debacle-roundup-part-vi/

#20yrsago Bruce Sterling on Sony DRM debacle https://web.archive.org/web/20060316133726/https://www.wired.com/wired/archive/14.02/posts.html?pg=5

#20yrsago ENIAC co-inventor dishes dirt, debunks myths https://web.archive.org/web/20060218064519/https://www.computerworld.com/printthis/2006/0,4814,108568,00.html

#20yrsago HBO targets PVRs https://thomashawk.com/2006/02/hbos-harrasment-of-pvr-owners.html

#20yrsago Princeton DRM researchers release Sony debacle paper https://web.archive.org/web/20060222235419/https://itpolicy.princeton.edu/pub/sonydrm-ext.pdf

#20yrsago HOWTO run Disneyland’s Haunted Mansion https://web.archive.org/web/20060208213048/http://tinselman.typepad.com/tinselman/2005/08/_latest_populat.html

#20yrsago RIAA: CD ripping isn’t fair use https://web.archive.org/web/20060216233008/https://www.eff.org/deeplinks/archives/004409.php

#15yrsago “Psychic” cancels show due to “unforeseen circumstances” https://web.archive.org/web/20110217050619/https://scienceblogs.com/pharyngula/2011/02/irony.php?utm_source=combinedfeed&utm_medium=rss

#15yrsago CBS sends a YouTube takedown to itself https://web.archive.org/web/20110218201102/https://www.reddit.com/r/WTF/comments/flktg/cbs_files_a_copyright_claim_against_themselves_o_o/

#15yrsago Lost luxury: the Boeing 314 flying boat https://web.archive.org/web/20110217144300/http://www.asb.tv/blog/2011/02/boeing-314-flying-boat/

#15yrsago Brazilian telcoms regulator raids, confiscates and fines over open WiFi https://globalvoices.org/2011/02/14/brazil-criminalization-sharing-internet-wifi/

#15yrsago Blatant disinformation about Scientology critic https://memex.craphound.com/2011/02/14/bald-disinformation-about-scientology-critic/

#15yrsago 3D printer that prints itself gets closer to reality https://web.archive.org/web/20110217072944/http://i.materialise.com/blog/entry/cloning-the-reprap-prusa-in-under-30-minutes

#15yrsago Damselflies’ curious mating posture https://www.nationalgeographic.com/photo-of-the-day/photo/damselflies-heart-shape

#15yrsago Simpsons house as a Quake III level https://www.youtube.com/watch?v=34LtrnnXQTc

#15yrsago Dapper Day at Disneyland: the well-dressed go to the fun-park https://web.archive.org/web/20110219162834/http://thedisneyblog.com/2011/02/16/dapper-day-at-disney-parks-this-sunday/

#15yrsago Horror/exploitation comic recounts the secret founding of the Comics Code Authority https://web.archive.org/web/20110218230149/http://comicsmakekidsevil.com/?p=88

#10yrsago After 3d grade complaint, Florida school district bans award-winning “This One Summer” from high-school library https://ncac.org/incident/florida-high-school-libraries-restrict-access-to-award-winning-graphic-novel

#10yrsago Watch: Claude Shannon, Jerome Wiesner and Oliver Selfridge in a 1960s AI documentary https://www.youtube.com/watch?v=aygSMgK3BEM#10yrsago

#10yrsago Hackers steal a hospital in Hollywood https://www.nbclosangeles.com/news/fbi-lapd-investigating-hollywood-hospital-cyber-attack/88301/

#10yrsago Watch: a home machinist makes a clock from scratch, right down to the screws and washers https://www.youtube.com/watch?v=KXzyCM23WPI

#10yrsago Matt Ruff’s “Lovecraft Country,” where the horror is racism (not racist) https://memex.craphound.com/2016/02/16/matt-ruffs-lovecraft-country-where-the-horror-is-racism-not-racist/

#10yrsago NYPD wants to make “resisting arrest” into a felony https://web.archive.org/web/20160205061338/http://justice.gawker.com/nypd-has-a-plan-to-magically-turn-anyone-it-wants-into-1684017767

#10yrsago Best wine-pairings for Girl Scout Cookies https://www.vivino.com/en/wine-news/girl-scout-cookies-and-wine–we-paired-them-and-the-results-are-amazing

#10yrsago John Oliver on states’ voter ID laws https://www.youtube.com/watch?v=rHFOwlMCdto

#10yrsago Morbid and risque Valentines of yesteryear https://memex.craphound.com/2016/02/15/morbid-and-risque-valentines-of-yesteryear/

#10yrsago App Stores: winner-take-all markets dominated by rich countries https://www.cariboudigital.net/wp-content/uploads/2016/02/Caribou-Digital-Winners-and-Losers-in-the-Global-App-Economy-2016.pdf

#10yrsago Skulls carved from vegetable matter https://dimitritsykalov.com/#intro

#5yrsago Privacy Without Monopoly (podcast) https://pluralistic.net/2021/02/15/ulysses-pacts/#paternalism-denied

#5yrsago Billionaires think VR stops guillotines https://pluralistic.net/2021/02/15/ulysses-pacts/#motivated-reasoning

#5yrsago ADT insider threat https://pluralistic.net/2021/02/15/ulysses-pacts/#temptations-way

#5yrsago Big Pharma will claim opioid fines as tax-deductions https://pluralistic.net/2021/02/14/a-fine-is-a-price/#deductible

Upcoming appearances (permalink)

A photo of me onstage, giving a speech, pounding the podium.


A screenshot of me at my desk, doing a livecast.

Recent appearances (permalink)


A grid of my books with Will Stahle covers..

Latest books (permalink)


A cardboard book box with the Macmillan logo.

Upcoming books (permalink)

  • "The Reverse-Centaur's Guide to AI," a short book about being a better AI critic, Farrar, Straus and Giroux, June 2026

  • "Enshittification, Why Everything Suddenly Got Worse and What to Do About It" (the graphic novel), Firstsecond, 2026

  • "The Post-American Internet," a geopolitical sequel of sorts to Enshittification, Farrar, Straus and Giroux, 2027

  • "Unauthorized Bread": a middle-grades graphic novel adapted from my novella about refugees, toasters and DRM, FirstSecond, 2027

  • "The Memex Method," Farrar, Straus, Giroux, 2027


Colophon (permalink)

Today's top sources:

Currently writing: "The Post-American Internet," a sequel to "Enshittification," about the better world the rest of us get to have now that Trump has torched America (1042 words today, 29792 total)

  • "The Reverse Centaur's Guide to AI," a short book for Farrar, Straus and Giroux about being an effective AI critic. LEGAL REVIEW AND COPYEDIT COMPLETE.

  • "The Post-American Internet," a short book about internet policy in the age of Trumpism. PLANNING.

  • A Little Brother short story about DIY insulin PLANNING

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