The 48-Hour Gamble That Made React: How Jordan Walke Secretly Rewrote Facebook's Newsfeed in a Rogue Programming Language Nobody Wanted

It was late 2011, and Jordan Walke had a problem that was driving him insane.

Facebook's ads dashboard was a mess. Every time someone clicked a dropdown, edited a field, or toggled a setting, the entire interface would stutter, lag, or just straight-up break. The code was a Frankenstein's monster of jQuery selectors, DOM manipulations, and event listeners that nobody understood anymore. Walke, a soft-spoken engineer with a background in functional programming, kept thinking: There has to be a better way to do this.

So he did what any frustrated engineer would do at 2 AM on a Tuesday: he built his own solution.

He called it FaxJS.

Nobody at Facebook had ever heard of it. Nobody asked for it. And when Walke showed it to his team, their reaction was unanimous: "This is weird. Why would anyone want this?"

Three years later, that "weird" side project would become React — the framework that powers Facebook, Instagram, Netflix, Airbnb, and millions of websites across the internet. It would kill jQuery. It would force Angular to completely reboot. It would create an entire ecosystem of tools, libraries, and careers.

But first, Walke had to convince his own company not to kill it.

The Ads Dashboard Nobody Could Fix

Facebook's ads product in 2011 was a nightmare to maintain. The interface was rich, interactive, and constantly updating based on user input. Drop down a menu, select an audience, adjust a budget slider — each action triggered a cascade of DOM updates, data fetching, and UI re-rendering.

The problem? Nobody could predict what would break.

The codebase was built with traditional imperative DOM manipulation — classic jQuery patterns where you'd manually select elements, attach event handlers, and update the DOM whenever state changed. Change one line, and three unrelated features would mysteriously stop working.

// The old way: imperative, brittle, impossible to reason about
$('#budget-slider').on('change', function() {
  var value = $(this).val();
  $('#budget-display').text(value);
  updateEstimatedReach(value);
  if (value > 1000) {
    $('#warning').show();
  } else {
    $('#warning').hide();
  }
  // ...and 47 other side effects nobody documented
});

Walke, who had studied functional programming and Standard ML at Cornell, kept thinking about a different model. What if instead of telling the browser how to update the DOM, you just declared what the UI should look like for any given state? What if the UI was just a pure function of data?

UI = f(state)

It was a radical idea. And it would require rewriting everything.

FaxJS: The Framework Nobody Wanted

Walke started building in secret. He pulled ideas from XHP (Facebook's PHP-based UI framework), functional programming concepts, and a healthy dose of "what if we just tried this?"

The core insight was the component model. Instead of scattering UI logic across event handlers and DOM queries, you'd bundle everything — markup, logic, and styling behavior — into self-contained components. Each component was a function that took data in and returned a description of what the UI should look like.

// The FaxJS way (which would become React)
function BudgetSlider({ value, onChange }) {
  return (
    <div>
      <input type="range" value={value} onChange={onChange} />
      <span>{value}</span>
      {value > 1000 && <Warning />}
    </div>
  );
}

Wait — what's that angle-bracket syntax doing in JavaScript? That was JSX, another wildly controversial decision. Walke wanted developers to write HTML-like markup directly in their JavaScript. Most developers hated it on sight. "You're putting HTML in my JavaScript?! That's disgusting!"

But the real magic was under the hood: the Virtual DOM.

Instead of directly manipulating the browser DOM (which is slow, clunky, and error-prone), React would maintain a lightweight in-memory representation of the UI. When state changed, React would:

1. Re-run your component functions to generate a new virtual DOM tree
2. Diff the new virtual tree against the old one
3. Calculate the minimal set of actual DOM operations needed
4. Batch and apply those changes efficiently

It was like Git for UI state — track changes, compute diffs, apply patches.

Walke rewrote a slice of the ads dashboard with FaxJS. It worked. It was fast. It was predictable. He showed it to his team.

They were... skeptical.

"This Will Never Scale"

The pushback was immediate and fierce.

"JSX is an abomination." Mixing markup and logic violated every principle of separation of concerns that web developers had learned. Templates should be in templates. Logic should be in JavaScript. This was chaos.

"The Virtual DOM is too slow." Re-rendering everything on every state change? Running a diff algorithm on every update? That could never be performant at scale. The browser already has a perfectly good DOM — why reinvent it?

"It's too different." Facebook's engineers were already productive with XHP and Backbone. Why throw that away for something completely alien?

But Walke had one thing going for him: it worked. The ads dashboard was faster, more stable, and easier to reason about. Bugs that used to take days to track down were now impossible by design — if the state didn't change, the UI couldn't change.

Still, FaxJS stayed internal. It was a curiosity. A side project. Nobody was betting the company on it.

Then Facebook started rebuilding the newsfeed.

The Instagram Acquisition That Changed Everything

In April 2012, Facebook acquired Instagram for $1 billion. The deal came with a mandate: integrate Instagram into Facebook as fast as possible. That meant rebuilding parts of Facebook's mobile web experience to feel more like Instagram — fast, responsive, photo-centric.

The newsfeed team, led by Pete Hunt, had a problem. The newsfeed is Facebook's core product — infinite scroll, real-time updates, likes, comments, shares, all dynamically updating as you scroll. The existing code was brittle and slow, especially on mobile devices.

Hunt had heard whispers about Walke's weird framework. He was intrigued. He asked Walke to help rewrite a small slice of the newsfeed as a proof of concept.

They worked over a weekend. They rebuilt the comment component — the part of the newsfeed where users could see and post comments. It was a perfect stress test: dynamic data, real-time updates, nested threading, likes on individual comments.

It shipped on Monday.

The team was stunned. What usually took weeks had taken 48 hours. And it was faster than the old version. The code was cleaner. Bugs were easier to fix. New features were easier to add.

Pete Hunt became React's first evangelist. He pushed to use it for more of the newsfeed, then for Instagram's web app, then for Facebook's entire mobile web experience. By early 2013, React was running on some of Facebook's most critical surfaces.

But it was still internal. Nobody outside Facebook had heard of it.

JSConf 2013: The Awkward Coming-Out Party

On May 29, 2013, Jordan Walke and Tom Occhino stepped onto the stage at JSConf US in Amelia Island, Florida, to open-source React.

The reaction was... mixed.

Developers in the audience were confused, skeptical, and sometimes openly hostile during the Q&A. JSX looked like a crime against web standards. The Virtual DOM seemed like over-engineering. Angular was the hot new thing — why would anyone switch?

One developer stood up and said what many were thinking: "This looks like a step backward. Why are you putting HTML in JavaScript?"

Occhino's answer was simple: "Because it works. We've been using this in production at Facebook for over a year, and it's made our lives dramatically better. We think you'll feel the same once you try it."

The JavaScript community was divided. Some early adopters — Netflix, Airbnb, Khan Academy — started experimenting immediately. Others dismissed it as Facebook hubris.

But something interesting happened over the next 12 months.

The Ecosystem That Ate the Web

React's adoption curve was slow, then sudden.

Developers who actually tried it kept having the same experience: initial disgust, then curiosity, then a gradual realization that this actually made their lives easier. The component model was intuitive. One-way data flow was predictable. The Virtual DOM actually was fast enough (and kept getting faster).

But the real killer app wasn't React itself — it was the ecosystem that exploded around it.

React Router made client-side routing elegant. Redux (inspired by Elm and Flux) gave teams a predictable way to manage application state. React Native (2015) let developers use React to build iOS and Android apps. Next.js (2016) made server-side rendering and static site generation trivial. Create React App removed the hellish webpack configuration barrier to entry.

By 2016, React was the most popular frontend framework on GitHub. By 2018, it was the default choice for new web projects. By 2020, knowing React wasn't a nice-to-have — it was table stakes for frontend developers.

jQuery's market share plummeted. Angular 1.x teams scrambled to migrate. Backbone became a relic. Vue emerged as a gentler alternative but still borrowed React's component model. The entire frontend world had realigned around React's philosophy.

React 19: The Bet Nobody Saw Coming

In December 2024, the React team dropped React 19 — and with it, a bombshell: the React Compiler.

For years, React developers had manually optimized performance using useMemo, useCallback, and React.memo to prevent unnecessary re-renders. It was tedious, error-prone, and easy to mess up.

The React Compiler automatically optimizes your components at build time. It analyzes your code, understands your dependencies, and injects memoization where needed — without you writing a single useMemo.

// You write this:
function ExpensiveList({ items, filter }) {
  const filtered = items.filter(item => item.type === filter);
  return <ul>{filtered.map(item => <li>{item.name}</li>)}</ul>;
}

// The compiler automatically generates optimized code equivalent to:
function ExpensiveList({ items, filter }) {
  const filtered = useMemo(
    () => items.filter(item => item.type === filter),
    [items, filter]
  );
  return <ul>{filtered.map(item => <li>{item.name}</li>)}</ul>;
}

It's a full-circle moment. React started with the radical idea that developers shouldn't manually manage the DOM. Now it's extending that philosophy: developers shouldn't manually manage performance optimizations either. The framework should do it for you.

Meta has been using the compiler in production on Instagram and Facebook since 2023. Early adopters report 20-40% performance improvements without changing a line of application code.

The Legacy: The Framework That Rewrote the Rules

Jordan Walke hasn't worked at Meta since 2018. He's off building ReasonML and exploring new programming paradigms. But his weekend project fundamentally changed how we build for the web.

React proved that declarative UI beats imperative DOM manipulation. That components are a better abstraction than templates. That one-way data flow makes large applications maintainable. That the right abstractions let you move fast without breaking things.

Today, React has over 220,000 stars on GitHub and is used by millions of developers. It powers the interfaces of Facebook, Instagram, Netflix, Uber, Airbnb, Discord, Reddit, The New York Times, and thousands more. The framework that started as "too weird" and "will never scale" became the foundation of the modern web.

All because one engineer looked at Facebook's ads dashboard in 2011 and thought: There has to be a better way.

And he was willing to bet 48 hours to prove it.