Yahoo acquired Paul Graham's former startup Viaweb in 1998

YC was partly inspired by an investor named Julian Weber

Y Combinator Cofounder Paul Graham’s former professor’s husband Julian Weber provided $10K in seed funding to Graham’s previous startup, Viaweb in its early days. In exchange, Weber received 10% of the company. Weber’s involvement inspired Graham to start a program where investors were more involved with the companies they contributed seed funding to.

Y Combinator, the startup accelerator, gets its name from the 'Y combinator' computer science concept.

Read Paul Graham’s initial post announcing YC’s first batch

In March 2005, Y Combinator cofounder Paul Graham announced the program that would become Y Combinator on his website.

Y Combinator was founded in 2005 to bridge gaps between founders and investors

In one of Paul Graham’s essays on his website, he took the time to explain how and why he and his cofounders (including his girlfriend at the time, and now wife, Jessica Livingston), came up with the idea of and eventually created Y Combinator.

Y Combinator cofounder Paul Graham keeps a public archive of his insightful essays

In addition to cofounding Y Combinator and other companies before it, Paul Graham is a prolific writer and artist. He chronicled many of his thoughts while building Y Combinator in a series of dozens of candid essays, all of which you can read in an online archive.

For Reddit's founders, the company's early days included choosing a dinner with Y Combinator's Paul Graham over a spring break trip, a $10M Condé Nast acquisition, and other pivotal moments.

YouTube was acquired by Google for $1.65B in stock during its second year

In 2006, Google acquired YouTube for $1.65B, only two years after its launch. Sequoia Capital, one of Silicon Valley's best-known venture firms, was an early investor in the streaming video platform, seeing it as the next step in the evolution of user-generated content that flourished online during the mid-2000s.

Mark Zuckerberg was nearly fired from his own company after refusing to sell Facebook to Yahoo for $1B

In 2006, Yahoo tried to buy Facebook for $1B. Despite enthusiasm from nearly all of Facebook's management team and board (which included PayPal cofounder and famed investor Peter Thiel at the time), then 22-year-old Zuckerberg turned down the offer, insisting that Yahoo undervalued the company and didn't have a clear vision for the future. Zuckerberg has since said he regrets not being clear about his intentions to grow the company with his team before the Yahoo bid, as almost all of the company's management team left after he turned down the offer.

The dot-com boom made Mark Cuban a billionaire

Cuban co-founded AudioNet with Todd Wagner in 1995 before it became Broadcast.com—a web app that allowed people to listen to sports commentary on their computers if they couldn't watch a game. In 1999, Yahoo bought Broadcast.com for $5.7B. By the time the market crashed, Cuban had already sold most of his stock in the company and had become a billionaire.

Peter Thiel and Elon Musk formed PayPal after merging two dot-com companies

Elon Musk cofounded "X.com," an online banking service, in 1999 with the idea that the web would become a financial repository as internet access expanded and became ingrained in daily life. Peter Thiel cofounded "Confinity" as a digital security service that morphed into a payments system. In 2000, the two merged to form PayPal, and in 2002, they sold PayPal to eBay for $1.5B.

Y Combinator cofounder, Jessica Livingston, once interviewed her husband and cofounder, Paul Graham

Two of Y Combinator's cofounders, Jessica Livingston and Paul Graham, were in a romantic relationship before they started the accelerator. They later married, and much later, Livingston started a podcast. In an episode of her podcast, Livingston and her cohost interview Graham about the beginning of YC and more.

Many original dot-com company founders were bought out early on

The people who bought the original domains for dot-com companies and had the ideas to start businesses were often bought out by investors before becoming well-known companies. Both Pets.com and Broadcast.com were acquired early on.

The dot-com bubble burst in the early 2000s

If you’ve heard of companies like Google and Yahoo, you’re already partially familiar with the dot-com bubble: a period from roughly 1995 to 2001, when internet companies were the hottest thing in venture capital. The “bubble” part of the term refers to the industry’s eventual implosion.

Facebook was almost sold to Yahoo! for $1B, but its CEO refused

The board tried to fire Mark Zuckerberg for his resistance, which he blames for failing to communicate the long-term vision of the company. He claims the company has succeeded by launching products quickly to learn faster than its competitors.

YouTube began as a quirky site invented by former PayPal employees

In February 2005, YouTube was launched by Steve Chen, Chad Hurley, and Jawed Karim. Their idea was to build a platform to support the convenient sharing of videos online, a relatively novel idea in the days of cable TV and early social media.

Visualize where the first batch of founders from the famous startup accelerator Y Combinator are now.

Google's early focus on simplicity and user experience drove its future successes

Google Search revolutionized information retrieval in 1998, but additional web-based products, including Gmail, Maps, Docs, and YouTube reinforced the company's core ad business while allowing it to aggregate the world's information. Forming Alphabet protected this business from riskier moonshot projects.

The software for wikis—user-editable websites—was launched in 1995

Computer programmer Ward Cunningham created the WikiWikiWeb online application based on an offline system that helped track how ideas moved through his company. The application enabled users to collaborate and edit website content through a web browser, as well as link pages without requiring a structured navigation scheme.

Elon Musk's first company was an online business directory called 'Zip2'

Musk started the online alternative to Yellow Pages in 1995 with his younger brother. Musk sold the company for $305M in 1999.

A Grateful Dead online bulletin board system inspired the early internet and counted some of tech's biggest names, like Apple's Steve Wozniak, as users.

Sears once tried to become a tech company

In 1984, Sears arguably created one of the first online retail services, called “Prodigy,” in 1984 alongside IBM and CBS. But it was more of a WeChat than an Amazon, offering a variety of other services to users a few years before the dot com era.

The Y Combinator startup directory includes every company YC has funded

The startup accelerator has funded more than 5,000 companies over the years. This YC-specific search engine lets you look up any company to find out if it's a YC alum.

Pets.com is one of the most emblematic dot-com companies

Pets.com—an e-commerce pet store webpage—is a prime example of dot-com companies burning through investments. Despite being a popular and well-known brand, the company struggled to generate enough revenue to become profitable. After raising approximately $82.5M in its February 2000 initial public offering, Pets.com filed for bankruptcy in November of that same year.

'The Million Dollar Homepage' is a snapshot of a dead internet

In 2005, 21-year-old Alex Tew set out to make $1M by selling $1 pixels on his website, effectively creating a standalone internet billboard. The gambit worked, and because the advertisements were one-time payments, the site looks the same as it did in 2005, despite many of the advertised sites going defunct since.

In high school, Mark Zuckerberg rejected Microsoft's proposal to buy his music suggestion software for $950K

Mark Zuckerberg and Adam D'Angleo built a website called "Synapse," which created playlists for users based on their listening preferences and an algorithm to suggest new songs, in September 2002.

Before 'The Facebook', Mark Zuckerberg made 'Facemash.com'

During Mark Zuckerberg's sophomore year at Harvard, he built a website that allowed users to rank and rate people's pictures from the school's online "facebooks" called Facemash.com, which quickly went viral. He was placed on academic probation for violating the school's rules around data, privacy, and computer usage. Zuckerberg says the website was a prank and he never intended for so many people to see it. FaceMash is credited with being the predecessor to Facebook.

See a ranking of the most popular websites on the World Wide Web from 1995 to 2023

America Online's homepage was the most popular website through mid-2021, when the Yahoo homepage took over and, shortly afterward, became the first website to reach 1 billion monthly visits. It would not be dethroned until early 2006 by Google, a major player in the search engine market.

The origin of the World Wide Web, plus a look at its first website and web browser

Invented by Tim Berners-Lee in 1989 while working at CERN—home of the world's largest particle physics laboratory—the Web was developed to facilitate the sharing of information among scientists at institutions worldwide. By the end of 1990, the first Web server was operational as a proof-of-concept on a NeXT workstation.

Uber's first investors included StumbleUpon founder Garrett Camp

In 2010 when Uber went out to raise money, prominent investors including Mark Cuban and Gary Vaynerchuk passed. Vaynerchuk actually said no twice.

Y Combinator changed the way startups around the world are built

Many of the philosophies that the leaders of Y Combinator have infused into the program’s portfolio companies have become the playbook for building the next big thing, such as its focus on founder personality and more.

Listen to the history of the first banner ad on the internet, which went live on Oct. 27, 1994, on HotWired.com and pioneered the modern concept of digital advertising.

See which companies folded and which survived the dot-com crash

Companies that primarily used the web as a platform for doing business were more vulnerable than companies that created technology. While hardware and software companies managed to make it to the other side, most e-commerce companies took a brutal beating and share prices plummeted.

The term 'startup'—which is typically used to describe private companies in their early stages of operation that focus on innovating new products or services to meet a market gap—can be traced back to a 1976 Forbes article.

In 1994, Amazon was founded as an online bookseller

Books were just the start, as founder Jeff Bezos' ultimate goal was to create an "everything store," using the internet to transcend the physical limitations of brick-and-mortar retail. The Seattle-based Amazon gradually added CDs and consumer electronics, becoming a dominant e-commerce player in the late 1990s, and one of the few dot-com companies to make it through the bust.

See the original websites for companies like Google, Facebook, and Apple

Explore archived images of homepages on websites dating all the way back to 1991.

Watch the DoorDash team's YC application video

In 2013, the cofounders of DoorDash created a simple, homemade video application to Y Combinator. They didn't know it at the time, but they'd be accepted—and their company would go on to be publicly traded on the NASDAQ.

Steve Jobs founded NeXT while on a break from Apple

While Steve Jobs was on a hiatus from working at Apple, he founded a company called NeXT and helped lead the release of its operating system NeXTSTEP. The operating system was used to create the first app store of sorts, as well as the first web browser.

Warren Buffett has been criticized for avoiding investing in tech stocks during the 1990s dot-com boom, as he wasn't confident in the future growth of the tech industry.

PayPal was started in 1998 by Peter Thiel

By the year 2002, PayPal went public for the first time—but that was far from the end of its business story. eBay later bought PayPal, then eventually spun it off. PayPal IPO'd for a second time in 2015.

View a tracker of the most popular search engines from 1993 to 2021

Before Google dethroned Yahoo! as the most popular search engine in 2002 on its way to dominating the market, significant shares of internet searches were conducted across multiple sites, including MSN, AOL, AskJeeves, and AltaVista.

At 12 years old, Mark Zuckerberg built a messaging platform for his family called 'ZuckNet.'

Stanford’s ‘How to Start a Startup’ series

Stanford’s archive of lectures about creating a startup includes advice from Y Combinator notables such as former YC president and OpenAI CEO Sam Altman and YC Cofounder Paul Graham.

Executives at American Online wanted to shut down AIM

Despite not seeing value in a service that could not be charged for, executives were pushed by the development team behind AOL's Instant Messenger to keep it free, which helped it reach 36 million active users. Screenname selection and away messages allowed users to express their individuality, and the use of emoticons sets the tone for future internet communication.

CEO Gary Tan explains Y Combinators guiding philosophy

Hear YC President and CEO Garry Tan talk about why he values earnesty and excellent communication skills in YC founders, his thoughts on AI, and more in this unexpectedly deep and in-depth interview.

Wikipedia arose from a failed, for-profit online encyclopedia

Nupedia was launched in 2000 by internet entrepreneur Jimmy Wales and internet project developer Lawrence Sanger, only publishing articles written by experts after a cumbersome seven-step review process. The two developed Wikipedia to allow the public to write articles for future review, but shifting to self-moderation contributed to Sanger's departure in 2002.

Bumble was originally created under the MagicLab parent company

When Blackstone acquired MagicLab in 2019, Bumble Founder and CEO Whitney Wolfe Herd was elevated to CEO of the entire parent company (which also owned Indian dating app Badoo). The parent company was rebranded as Bumble Inc.

Facebook launched in a Harvard University dorm room in 2004

The controversial "FaceMash," where students rated each other's attractiveness, was the precursor to Mark Zuckerberg's social network. The platform rebranded as Meta after several acquisitions and a push into virtual reality, distancing itself from controversies.

One Facebook investor turned $500K into $1B

Peter Thiel was Facebook's first big investor. In 2004, he invested $500K into the social network, long before the company owned Instagram or renamed itself "Meta." In 2012, when he sold off most of his stake, he turned that initial $500K investment into more than $1B in cash.

The world's first webcam was invented in the early 1990s by scientists at Cambridge Computer Laboratory to monitor a coffee pot for researchers working in different labs on various floors.

The early success of Facebook made Mark Zuckerberg a college campus celebrity

Within 24 hours of launching in 2004, more than 1,200 Harvard students signed up to the platform, which quickly expanded to other Ivy League and Boston-area schools within months. By year's end, Zuckerberg left Harvard to run the company in California.