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Mathematician at UCLA, working mainly in harmonic analysis and partial differential equations. Writes What's new, a long-running blog on their research, open problems and expository notes.

• Why Do We Need Human Mathematicians Anymore?

  [This is a guest post by Po-Shen Loh, crossposted from his blog, where an illustrated version appears. This blog post was initially written in a different file format and converted using AI. — T.] Similar logic applies…

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Writes Stratechery, a subscription newsletter on the business and strategy of technology, and hosts the Dithering and Sharp Tech podcasts.

• I have always said understanding accounting is underrated. I now realize understanding finance — specifically discount rates — is underrated as well. Long but excellent.
  Quoting@banteg>be me >discover effective altruism >apparently normal charity is inefficient >why donate to random sad thing when spreadsheet can tell you optimal sad thing >fair enough >buy mosquito nets >save lives >numbers look good >feel powerful >couple years later >someone asks an innocent question >why onl…

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Writes Slow Boring, a near-daily newsletter on American politics and public policy; co-founded Vox in 2014 and left it in 2020.

• Trying to convince people you’re right is underrated

  Plus prepper takes and the end of history

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Professor of economics at George Mason University and Bartley J. Madden Chair at the Mercatus Center. Co-writes the blog Marginal Revolution and co-authors the textbook Modern Principles of Economics with Tyler Cowen.

• ZCash is having a governance debate thanks to @maxdesalle, @zooko, @matthuang and others. It's a perennial debate because everything DeSalle says about the weakness of governance institutions is correct and yet when it comes to public goods, externalities and increasing returns--all of which are critical for ZCash-there is very little choice but a governance institution. N.B. All DeSalle says also applies to firms! Firms are islands of central planning. Central planning is inefficient. So shouldn't people who appreciate markets want to get rid of firms?! No. The boundary between firms and the…
  Quoting@matthuangA few thoughts on ZCash (disclosure: Paradigm is an investor in ZEC and ZODL): - All blockchain ecosystems struggle with long-term funding, especially of public goods, and an inflation-funded developer fund is an elegant mechanism to do so. How this fund is allocated is a fair debate, and we should…

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Singaporean writer and author of FRIENDLY AMBITIOUS NERD; blogs at visakanv.com about ambition, writing and thinking in public.

• good news: I’m still available for marketing consults (see pinned tweet)
  Quoting@pmituterrible news: Marketing (even with the use of AI) is still super hard

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Geneticist and writer on human population genetics, deep history and evolution; author of the Unsupervised Learning newsletter.

• this sort of tweet is fine. i have the same concerns
  Quoting@BlakeSNeffI think this is one of the most important facts to be aware of in the debate over Indian immigration: Even relative to other Asian immigrants, Indian Americans are on average very liberal, not just in terms of voting Democrat but also holding particularly left-wing views on specific issues. Indian…

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• so what should i do about it? not tweet about genetics? 🤷🏾‍♂️
  Quoting@ProfBootyPhD@razibkhan "As usual when i get surfaced in some parts of X" - you are too generous to your followers (understandably). Almost every time you post about anthropology and genetics, the same people are there to slurp up every factoid that might support white superiority.

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Writes The Diff, a newsletter on inflections in finance and tech read by hedge fund managers, founders and VCs. Previously worked in finance at SAC Capital/Point72.

• An underrated positive externality of public transit is that it’s a honeypot for identifying everyone who’d commit a crime for literally $3. Done thoroughly, it’s a massive improvement for public order.
  Quoting@420jokeMamdani’s NYPD btw. This could be handled via a ticket with a fine payable to MTA, or even a summons written on the spot with a court date. Instead, officers are given permission to make custodial arrests, haul ppl into central booking, and charge them w/ A Misdemeanors over $3.

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American author of The Subtle Art of Not Giving a F*ck and Everything Is F*cked. Writes essays and book reviews at markmanson.net.

• I've said it for years: video games are massively underrated. Unlike TV or phones, the data on people who play videos games casually is surprisingly good. It's people who are addicted to them and play them compulsively that give them a bad reputation.
  Quoting@anishmoonkaPlaying Super Mario 64 for 30 minutes a day for two months physically grew the brains of the people who played it. A 2014 study in Molecular Psychiatry scanned participants before and after two months of daily play and found increases in grey matter in three regions involved in memory, planning, an…

  AddictionRelated

Writes Hyperdimensional, a newsletter on AI policy and governance. A White House AI policy adviser in 2025; joined OpenAI on 6 July 2026 to lead its Strategic Futures team.

• op deleted his tweet (thanks I guess) but I get a ton of questions about why I sometimes limit replies, and if you’d like to know the answer you can look below.
  Quoting@deanwball@sponkostonko I limit my replies when it occurs to me to do so to make it slightly harder for people to threaten me and my family with violence, which happens frequently in my life now. It still happens, but at least with replies limited my wife is less likely to see it.

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Co-creator of Django and creator of Datasette; writes daily at simonwillison.net.

• The contagion of fear

  Bryan Cantrill responds to the tweet by former Anthropic employee Jacob Coxon confirming that many Anthropic researchers believe AI "could kill us all by the end of the decade". Bryan shares a story of his own youthful…

  AnthropicRelated

Writer on the intersection of technology and finance. Author of the Bits about Money newsletter and host of the Complex Systems podcast; previously at Stripe.

• I feel like the extent of the government/NGO Internet censorship apparatus is extensively underrated by people interested in AI safety, in particular how it pattern matches to calls for neutral third parties to people of the political persuasion who were targets of the censorship

  AI alignmentgovernmentRelated

Moroccan senior frontend developer writing at smakosh.com; builds side projects and client work under Smakosh LLC.

• This applies to your total revenue as well
  Quoting@ImLunaHeyholy shit, all i did was migrate from typescript to rust.

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Economist and journalist; Financial Times columnist as The Undercover Economist, author of How to Make the World Add Up, and presenter of the Cautionary Tales podcast.

• My tweet was less about how to do the task, and more about what happens when I tried to use a well-established tool (Google search). Also - isn't the very high failure rate interesting? 'Sometimes makes errors' is one thing. 'Always makes errors' is something else.
  Quoting@joshgans@TimHarford You need to use a real AI agent to do that task.

  GoogleRelated

Creator of Flask and Jinja. Writes about software at lucumr.pocoo.org.

• Interpreting Pangram

  Original prompt to generate a David Sacks like tweet

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Writes Hyperdimensional, a newsletter on AI policy and governance. A White House AI policy adviser in 2025; joined OpenAI on 6 July 2026 to lead its Strategic Futures team.

• I’m going to delete this tweet and post screenshots here for posterity. I stand by the argument but we shouldn’t fight. This is too important for squealy arguing. I am going to choose to see David’s OP as an olive branch and operate under that assumption. TYFYATTM!

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Creator of Homebrew, the macOS package manager, and a Swift developer.

• Clicking the Grok button is rarely satisfying. If the tweet is “I like grooglefabs” Grok will delightfully tell you “FooBar comments on his love of grooglefabs. A common sentiment among the fabblegrooglers”. I don't want to type “wtf is a grooglefab”. You are meant to be AGI.

  AGIRelated

Machine learning engineer and consultant focused on RAG and retrieval systems. He writes about applied AI engineering at jxnl.co and is the author of the instructor library.

• people reviewing jasmines tweet before the culture fit interview
  Quoting@jasminewsunI hear roughly 3 reasons people keep working at AI labs despite believing in ~10% extinction risk: 1) Techno-determinism: Someone will build ASI no matter what, and I can do it better & more safely than China/OpenAI/etc 2) Consequentialism: ASI might kill us, but it also might produce utopia/immort…

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Creator of Claude Code at Anthropic.

• Background computer use is underrated
  Quoting@claudeaiClaude can now use your computer in the background in Claude Cowork and Claude Code. Give it something to do on your desktop and Claude clicks, types, and opens apps just like you would, while you work on something else.

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Professor of finance at NYU's Stern School of Business, known for his work on valuation. He publishes his data, spreadsheets and classes free at Damodaran Online and writes the Musings on Markets blog.

• I use this Vinod Khosla tweet with apologies to Vinod, since tweets are often out-of-context or emotive, to launch a discussion on the trade-off between scaling up and building business models (profitability) that every business faces.

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Economist; former chief economist of the International Monetary Fund.

• another tweet written a bit too fast. By "central bank debt" I mean public debt held by the central bank". Apologies☹️
  Quoting@ojblanchard1No, and useful to repeat: Contrary to interventions such as QE or debt management by Treasury, cancellation of central bank debt has zero mechanical effect on the liabilities of either the central bank (bank reserves are the same) or the government (the debt held by private investors is the same)

  public debtinterest ratesRelated

CEO of SafeGraph, host of the World of DaaS podcast, and author of the Summation newsletter; previously founded LiveRamp.

• The most underrated candy is: wine gums (this has been scientifically proven)

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Writer on the intersection of technology and finance. Author of the Bits about Money newsletter and host of the Complex Systems podcast; previously at Stripe.

• I think people who have never started an organization underrate the achievement of spontaneous organization for a project of non-trivial complexity. One reason it is underrated is we expect orgs to work, as they all seem to work. plane-with-chickenpox.png
  Quoting@tszzlagent civilization is an apt and correct term and it’s a symptom of abject cope that people are having this immune reaction to it. models started developing and compiling technology through complex multiagent R&D projects while also performing various forms of trade

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Creator of Homebrew, the macOS package manager, and a Swift developer.

• Automic Vault means your CLI tools don’t perform sensitive actions without your approval. This applies to agents and supply chain attacks both. We patch tools at the *packaging layer*. Blessed Scripts allow you to make small, vetted scripts that escalate tool capabilities. Reentrant Blessed Scripts are a scripting pattern that allow you to “weave” in agent capabilities. Interleaving deterministic work with escalated Tool capabilities and secrets with applied intelligence. Perfect for automations.
  Quoting@AutomicVaultWe have documented the concept of `Reentrant Blessed Scripts` that describe our suggested mechanism of giving Agent Automations a set of escalated capabilities and secrets. Have the automation execute a Blessed Script with Automic Vault front-matter for the capabilities and…

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American software engineer; worked on code-server at Coder and teaches TypeScript and open-source contribution. Publishes at joeprevite.com.

• today is the day you stop doomscrolling stay with me - this will take 5mins 1. open the AppStore 2. download "ScreenZen" (free) 3. configure limits (e.g. 4 15-min sessions) 4. start with 1 social media app 5. a few days later, add another 6. repeat until you've added all apps too busy right now? add a calendar event with this tweet and do it this weekend trust me, you'll thank me next month

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Software engineer; co-founder and former CTO of Tailscale, previously on the Go team at Google.

• this old tweet is getting some likes (why? mysterious), so I re-read it, and still like it. it also applies really well to what I am working on now: I need lots of VMs for agents, but I don't need lots of CPU/RAM. hence @exedev
  Quoting@davidcrawshaw@danluu one of the big early ideas behind tailscale was a single computer is powerful enough to solve almost every problem, and that this is not widely understood. we need fewer distributed systems and more spreadsheet implementations.

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Designer and engineer; formerly principal research engineer at GitHub Next; writes at wattenberger.com.

• there's something rotten in the air when >90% of the replies to a tweet like this are mean spirited sure, it might not be your thing and it's easy to forget this box doesn't go straight into the void. but can we try to bring more kindness into the world?
  Quoting@WattenbergerI look away for one week and VSCode got cute?!

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Indian technology consultant and writer. Former editor of Beautiful Pixels; writes about Apple hardware and Mac software at nuclearbits.com.

• I saw Atul's tweet and it made me wonder too. How many establishments are actually compliant? So we asked the FDA. Here's what they say!

  mid-day.com

  Quoting@atulkasbekarSerious question Of all the raids that were carried out on food establishments, were there any places that were given a clear green chit? As in, everything is perfect, well done! I’d really like to know which places were adhering to standards

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Writer of the personal-finance blog Of Dollars And Data and author of Just Keep Buying and The Wealth Ladder. Chief Operating Officer at Ritholtz Wealth Management.

• The Problem with Optionality

  I’ve seen a lot of discussions this year around maximizing freedom and optionality. For example, consider this tweet: If you ever get up $1M in cash Buy a new modern apartment in the UAE for like $550k (you have zero pr…

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Economist at George Mason University, co-author of Marginal Revolution, host of Conversations with Tyler. Writes in short, dense claims about economics, culture and AI, and has moved position on AI in public more than once.

• Andrew Graham-Dixon on Vermeer, a Forgotten Sect, and Underrated Artists

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Member of technical staff at Anthropic. He has led ML/AI teams at Amazon, Alibaba and Lazada, and writes about LLMs, recommender systems and engineering at eugeneyan.com.

• When evaling models, we anchor on the median task. But this is like how devs estimate the median task accurately but underestimate the mean which tends to be ~2x estimated (thus "double your estimates"). This applies to models too—we optimize for time/cost on median tasks. But it's the tail tasks that determine a project's completion, and reliable models (like Fable and Opus) are the diff between success and failure. Work with models as collaborators, not tools. Go beyond pair-programming, where given a narrow spec, the tool just executes in minutes. Instead, explain your intent and what succ…
  Quoting@Steve_YeggeFable is careful. None of the other models are careful. GPT-5.6 Sol, Opus, Kimi, Grok. You can compare them all day long on capabilities, and it doesn't matter, because in order to use a model for real production work, it must first and foremost be careful. That's the only dimension that matters to…

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Co-founder of Modem and a founding engineer at Sentry, where he went on to be VP of Engineering. Co-author of Third-party JavaScript, and co-host of the State of Agentic Coding podcast with Armin Ronacher.

• prompt-cardio — Prompt Faster: the vibe coding interview. A typing test disguised as an AI chat.

  Commitsfeat(ui): tweet-sized results card · feat: harder rank curve — CTO of Vibes now demands 140+ wpm · feat: swarms are engine-injected at rounds 2/4/6 — skill unlocks the spectacle

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Swedish essayist who writes Escaping Flatland, a newsletter of essays on relationships, thinking, writing and homeschooling.

• How not to forget what matters

  1. Every few months I will read a tweet, or have a conversation, that makes me feel this is important, I must remember this.

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Founder of Terraform Industries and formerly a physicist at NASA's Jet Propulsion Laboratory; writes about energy, space and manufacturing.

• The enormous size of the oil and gas market drives adoption of synthetic fuel production

  Originally posted at the Terraform blog June 16 2026. One of the underrated joys of hardware tech development is having the opportunity to tell and retell the story until it gradually becomes less mysterious. To me, wha…

  energyRelated

Writer and former Substack product manager; publishes essays and interviews on technology, culture and China at jasmi.news.

• I think "being real with yourself" is the most underrated cognitive skill for the AI age — AI makes it too easy to lie to yourself: to self-congratulate for the illusion of thinking, productivity, etc. But you gotta actually know: Am I being more productive, or just tokenmaxxing? Am I upskilling myself with AI, or letting it do the hard part for me? Does my essay/business/product idea make sense, or did I let an LLM convince me it does? Then you won't need hard rules like “always/never use AI for X.” If you pay attention and avoid self-deception, you'll be able to *feel* when you are doing re…

  LLMsRelated

Co-founder of AngelList. Writes and podcasts at nav.al in short, aphoristic pieces on startups, wealth and judgement rather than long essays.

• A Return to Code

  You’re listening to the Naval Podcast. This is Nivi, his regular co-host. Today we’re going to talk about vibe coding. Let me tee up the conversation with a tweet from Naval from March 23rd: “AI coding agents can now de…

  coding agentsRelated

Founding member of OpenAI and former director of AI at Tesla; creator of nanoGPT and the term "vibe coding".

• Farzapedia, personal wikipedia of Farza, good example following my Wiki LLM tweet. I really like this approach to personalization in a number of ways, compared to "status quo" of an AI that allegedly gets better the more you use it or something: 1. Explicit. The memory artifact is explicit and navigable (the wiki), you can see exactly what the AI does and does not know and you can inspect and manage this artifact, even if you don't do the direct text writing (the LLM does). The knowledge of you is not implicit and unknown, it's explicit and viewable. 2. Yours. Your data is yours, on your loca…
  Quoting@FarzaTVThis is Farzapedia. I had an LLM take 2,500 entries from my diary, Apple Notes, and some iMessage convos to create a personal Wikipedia for me. It made 400 detailed articles for my friends, my startups, research areas, and even my favorite animes and their impact on me complete with backlinks. But,…

  LLMsRelated

• Wow, this tweet went very viral! I wanted share a possibly slightly improved version of the tweet in an "idea file". The idea of the idea file is that in this era of LLM agents, there is less of a point/need of sharing the specific code/app, you just share the idea, then the other person's agent customizes & builds it for your specific needs. So here's the idea in a gist format: https://t.co/NlAfEJjtJV You can give this to your agent and it can build you your own LLM wiki and guide you on how to use it etc. It's intentionally kept a little bit abstract/vague because there are so many directio…
  Quoting@karpathyLLM Knowledge Bases Something I'm finding very useful recently: using LLMs to build personal knowledge bases for various topics of research interest. In this way, a large fraction of my recent token throughput is going less into manipulating code, and more into manipulating knowledge (stored as mar…

  LLMsRelated

Mac and iOS developer; founder of Red Sweater Software (MarsEdit, FastScripts) and co-host of the Core Intuition podcast.

• Just about every >150 IQ person I know made up their IQ score. Making up your IQ score is underrated and misunderstood.
  Quoting@maxmarchioneJust about every >150 iq person I know uses nicotine. Nicotine is underrated and misunderstood

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Writer and author of All the Wrong Moves; his newsletter covers meditation, relationships and creativity, and he co-runs a perfume line.

• Underrated sources of mental tension in meditation

  loosen up in unexpected ways

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Swedish essayist who writes Escaping Flatland, a newsletter of essays on relationships, thinking, writing and homeschooling.

• When my Substack had sub-100 subscribers, I would contact nearly everyone who commented (on internet forums where I cross posted my essays). Most people are up for a conversation if they think you wrote a decent post, but it usually doesn’t happen if you’re not the one asking for it. I met some truly extraordinary people that way, and grew so much from our conversations. I think it is a very underrated way to use the internet.

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Experimental psychologist and author of the blog Experimental History, on psychology, science reform and creativity.

• Underrated ways to change the world, vol. II

  OR: why you should sell onions on the internet

  Related

Founder of the Silicon Valley Product Group; wrote Inspired, Empowered and Transformed on how product organisations work.

• Build vs Buy in the Age of AI

  One topic that has been around since the beginning of the tech industry, is whether we should build or buy in order to solve some problem? This question applies to traditional IT, as well as to every product team. There…

  Related

Experimental psychologist and author of the blog Experimental History, on psychology, science reform and creativity.

• This is an underrated way to approach writing a blog
  Quoting@eric_is_weird@a_m_mastroianni @JacobTref @tkalil2050 There are a few dozen names like that I think of myself as "writing for." Only a few (if any!) of them may read any given piece. But from Day 1, that's how I thought about the Substack.

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Programmer and writer on computer architecture, performance, and software reliability. He has worked on CPU design at Centaur Technology and on software at Google and Microsoft, and writes long-form technical essays at danluu.com.

• Steve Ballmer was an underrated CEO

  danluu.com

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British software developer at Laravel and creator of the Cachet open-source status page system. Podcaster; writes at james.brooks.page.

• tweet.new — Say hello to tweet.new, your shortcut to posting faster on X!

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CEO of Vercel; creator of Next.js and Socket.IO. Writes at rauchg.com.

• ray-city — A city animation that fits in a tweet

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Writer and engineer behind the blog Melting Asphalt, and co-author with Robin Hanson of The Elephant in the Brain.

• I'm excited about the LessOnline festival! May 31 – June 2 (Link in next tweet, smh Elon.....) Hit me up if you're planning to attend — it'll be great to see some internet friends IRL

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Writer and consultant on formal methods and software correctness; author of Practical TLA+ and Logic for Programmers.

• Don't let Alloy facts make your specs a fiction

  I’ve recently done a lot of work in Alloy and it’s got me thinking about a common specification pitfall. Everything in the main post applies to all formal specifications, everything in dropdowns is for exper…

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Writer and engineer behind the blog Melting Asphalt, and co-author with Robin Hanson of The Elephant in the Brain.

• mind-expanding short story by @etirabys about a "sapient mitotic species" this is a rare piece of fiction that's well grounded in evolutionary biology and psychology i read it about 6 months ago and have re-read it twice since 👇 link in next tweet

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Brazilian-American staff software engineer working on platforms, AI and developer productivity. Writes about engineering and his setup at ivansantos.me.

• That's my first tweet with @typefully. How come I didn't know about this tool before? 🔥

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Researcher and science writer. Co-founder and editor at Works in Progress magazine, formerly a researcher at Our World in Data, and author of the Scientific Discovery newsletter on science, global health and medical innovation.

• How many people die from snakebites?

  This week: Missing data – the most underrated problem in global health.

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Co-founder and partner at Union Square Ventures in New York. Has written the AVC blog almost every day since 2003, on venture capital, startups, music and crypto.

• This tweet stream showcases some of the writing by USV analysts over the years. Though they have moved on to bigger and better things, their writing and their ideas live on at USV and https://t.co/btPOKgjAa4. It is a gift that keeps on giving.
  Quoting@nickgrossmanReminder that applications are now open for the next class of @USV analysts! One of the ways that USV analysts work is through writing, both about thesis areas and new investments. To give a flavor, here are some highlights of writings by USV analysts over the years:

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Writer living in Brooklyn and former Man Repeller features director; writes the weekly newsletter Maybe Baby on culture and consumption.

• The wild acceleration (and disposability) of trends and memes now basically applies to thought itself.

  haleynahman.substack.com

  Related

Co-founded Neuralink and founded Science Corp, which is building a retinal implant; writes about neural interfaces and biology.

• What does Twitter asymptote to?

  Consider the following interpretation of Twitter: Twitter is a process that is applied to a human thought vector $x$, a time $t$, and a state vector $c_{t-1}$ which emits a value $tweet$ and a new state vector $c_{t}$.…

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Engineering leader and writer; wrote The Manager's Path and Platform Engineering, and blogs at Elided Branches.

• Driving Cultural Change Through Software Choices

    This tweet got me thinking about change, and how software engineers (and especially, Platform teams) can drive cultural change throughout companies. First, let’s take the question. You want to change the engineer…

  Related

Founding member of OpenAI and former director of AI at Tesla; creator of nanoGPT and the term "vibe coding".

• A Recipe for Training Neural Networks

  Some few weeks ago I posted a tweet on “the most common neural net mistakes”, listing a few common gotchas related to training neural nets. The tweet got quite a bit more engagement than I anticipated (including a webin…

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Financial journalist; chief financial correspondent at Axios and host of the Slate Money podcast, previously a blogger at Reuters and author of The Phoenix Economy.

• Nota bene: Gallows humor

  Did you laugh when you saw this tweet?

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General partner at Benchmark Capital for over two decades; was the lead analyst on Amazon's IPO before moving into venture capital. Writes Above the Crowd on tech and marketplace economics.

• The Ezra Klein Show: VC Bill Gurley on Transforming Health Care

  In November of 2015, I posted a tweet that declared Benchmark was interested in discovering Internet healthcare investments. Our firm has had the good fortune to invest in many two-sided networks that used information a…

  benchmarksRelated