Facebook’s Pre-IPO Repricing Journey: From Campus Network to $100 Billion Platform

1、The core purpose of this report is not merely to retell Facebook’s early history, but to answer a more important question:
How can a social networking company undergo repeated re-ratings before going public, moving in only a few years from a valuation in the millions to tens of millions, hundreds of millions, tens of billions, and ultimately more than one hundred billion dollars?
Facebook is one of the most classic and representative case studies because it went through nearly every major valuation logic used for social network companies: user-network effects, platformization, advertising monetization, mobile-transition optionality, private secondary-market repricing, control-structure engineering, and pre-IPO liquidity pressure.

3、If one looks only at the outcome, Facebook priced its 2012 IPO at $38 per share, implying a valuation of about $104 billion. But the path was not linear growth. It was repeatedly redefined by the market at different stages using different narratives.
In 2004, Peter Thiel invested at roughly a $5 million valuation. In 2005, Accel entered at roughly a $98 million valuation. In 2006, the Greylock / Meritech round pushed the company to roughly $500 million. In 2007, Microsoft’s investment took the notional valuation to $15 billion. In 2009, DST invested at roughly a $10 billion preferred-share valuation, while common-stock transactions at one point implied a value of only about $6.5 billion. In 2011, Goldman Sachs and DST pushed the company to around $50 billion. Then the IPO came at roughly $104 billion.

4、So Facebook’s valuation journey was not simply “the market liked it more and more.”
A more accurate way to frame it is this: each financing round answered a different question.
The earliest rounds asked whether this was merely a campus hit. The middle rounds asked whether this could become global social infrastructure. The later rounds asked whether Facebook could turn attention, identity, relationship graphs, and advertiser demand into a durable cash engine. The final pre-IPO rounds asked whether it was no longer a startup at all, but a next-generation internet quasi-infrastructure platform. Once those questions were answered in sequence, valuation jumped accordingly.

Founder background and the company’s starting point
1、To understand Facebook’s starting point, one has to begin with Mark Zuckerberg’s upbringing, because Facebook’s early product philosophy was tightly coupled to his personal skill set.
Meta’s official materials state that Zuckerberg was born in White Plains, New York, and later moved from Harvard to Palo Alto in 2004. Publicly available sources consistently describe him as growing up in Dobbs Ferry, New York, in an upper-middle-class, education-rich, technology-exposed household: his father Edward Zuckerberg was a dentist and his mother Karen Kempner was a psychiatrist. Meta’s own bio confirms that Zuckerberg was born in White Plains and studied computer science at Harvard.

2、What matters here is not only the “professional middle-class” label, but the fact that technology entered the home environment early and densely.
A New Yorker profile noted that the family home and dental office were full of computers, and that Zuckerberg built ZuckNet as a child to connect computers in the house and his father’s office. This suggests that programming was not something he adopted only in college; it was part of his natural mode of making things from childhood onward. He was not someone who learned coding because he saw a business opportunity; he was first a builder and only later a founder.

3、Educationally, he was not a typical “academic entrepreneur.” He was much closer to a product hacker.
Public sources indicate that at Harvard he studied along the lines of psychology and computer science; The New Yorker also noted that before Harvard he already had a reputation as a programming prodigy, and at Harvard he created CourseMatch and Facemash. This matters because it created a dual capability structure:
on one side, he could ship product very quickly;
on the other side, he was interested in why people want to connect, express themselves, and be seen. That later translated directly into Facebook’s early obsession with real identity, social graphs, and activity streams.

4、Before Facebook, Zuckerberg had almost no traditional formal job history.
The public record is much more about a sequence of software projects than about conventional employment: ZuckNet, Synapse, CourseMatch, Facemash. This is important because Facebook was not spun out of a big company or some corporate incubator. It emerged organically from a line of student-built systems focused on information matching and human connection. In other words, Facebook was not a “career pivot”; it was a continuation of the same underlying thread.

5、The founding team mattered too, but this was not a uniformly distributed team.
Reliable public accounts consistently show Facebook’s co-founders as Mark Zuckerberg, Eduardo Saverin, Dustin Moskovitz, Andrew McCollum, and Chris Hughes. The best-supported characterizations of their roles are:
Zuckerberg for core product and code;
Saverin for early business and initial financial support;
Moskovitz as a major early engineering force, later CTO / engineering lead;
McCollum for early design and the first logo;
Hughes for early communications and a de facto spokesperson role.
That means Facebook was not just the output of a lone genius. It was already, from an early stage, an organizational prototype combining product, engineering, design, communications, and seed financing.

6、Facebook may have started in a Harvard dorm room, but the real company-building turn happened after the move to Palo Alto in 2004.
Meta’s official material confirms Zuckerberg moved to Palo Alto in 2004, and Harvard Crimson also documented his departure from Harvard later on. This move mattered because it marked the transition from campus project to Silicon Valley startup, and from “natural user growth” to simultaneous scaling in capital, hiring, sales, and infrastructure.

Education, early projects, and how Facebook entered the core field
1、To understand why Facebook became more than another Friendster or MySpace, one has to examine Zuckerberg’s projects before Facebook.
CourseMatch let students see who else was taking a class. Facemash used campus photos in a comparative rating format. These may look unrelated on the surface, but underneath they shared the same logic:
obtain identity data, visualize latent relationships or comparisons between people, and turn those structures into behavior.
That is already proto-Facebook logic.

2、Facemash matters especially because it exposed the dual nature of Zuckerberg’s early product worldview.
The Harvard Crimson recorded that Facemash brought him into conflict with Harvard over security, copyright, and privacy. On one hand, it showed his instinct for rapidly turning existing identity data into high-virality software. On the other hand, it foreshadowed a theme that would follow Facebook for years:
growth, sharing, and visibility repeatedly colliding with privacy, authorization, and boundaries.
That tension was not an accidental later development. It was present in embryonic form from the start.

3、Facebook itself was not built for “the world” from day one.
It started as a Harvard directory and quickly expanded across universities. When Harvard Crimson covered the Accel investment in 2005, it reported nearly 3 million registered users across more than 800 colleges. At this stage, the key was not revenue. It was that Facebook seized a higher-quality position than MySpace:
it was not an open-ended self-expression community first; it was a product built on real identity, trust, and a mapped social graph.
In social networking, network quality often matters more than raw open-ended scale in the earliest valuation phase.

4、The year 2006 was the moment Facebook’s category definition changed fundamentally.
That year, when Facebook announced a new round, it said the site had grown past 7 million users and ranked among the world’s major web properties in comScore data. It was also the year News Feed launched, pushing Facebook from a static profile directory to a dynamic flow of social information. This was a category shift: Facebook stopped being merely a student directory and became a product that could continuously occupy user attention. For valuation, that meant investors could stop looking only at registrations and begin looking at time and engagement.

5、The backlash to News Feed actually proved Facebook had found its real product core.
News Feed triggered heavy user resistance in 2006, and Facebook had to add more privacy controls while Zuckerberg publicly admitted, in effect, that the company had mishandled the launch. But in the long run News Feed was not a failure. It was one of the most important inflection points in Facebook’s entire pre-IPO valuation story.
From that point onward, Facebook had a product structure that could reorder information, distribute content continually, and eventually insert ads at scale. Without Feed, there was no usable ad inventory engine.

6、Then in 2007 Facebook Platform became the second major category jump.
Facebook’s official materials show that Platform launched at F8 in 2007 with 65 developer partners and more than 85 applications. The meaning of Platform was not just that Facebook had “more features.” It meant the market could begin to view Facebook not as a single website but as a possible social operating system.
In valuation terms, product companies and platform companies are priced differently. Product companies are mainly valued on revenue, growth, and retention. Platform companies get additional credit for ecosystem position, developer lock-in, externalities, and future take-rate potential. Facebook’s move toward a $15 billion valuation in 2007 was inseparable from that platform narrative.

Capital relationships and the path of repeated pre-IPO re-ratings
1、Facebook’s pre-IPO valuation history can be broken into seven stages.
These are not just financing events. They are seven instances in which the market redefined what Facebook was.

2、Stage one was 2004: from campus project to financeable company.
Reuters’ later retrospective states that Peter Thiel invested $500,000 in 2004 at roughly a $5 million valuation, receiving about 10% and a board seat.
The point of this stage was not mainly the amount of money. It was that Facebook was being recognized by an outside investor as a company that should be developed independently rather than sold immediately.
This was also the period in which Sean Parker was crucial in helping translate Facebook from a student project into something legible to Silicon Valley capital.

3、Stage two was 2005: from campus hit to high-growth social network.
Reuters reported that when Accel invested $12.7 million in 2005, the implied valuation was about $98 million. Harvard Crimson confirmed that by the time of the roughly $13 million Accel round, Facebook already had nearly 3 million users.
The shift from $5 million to nearly $100 million was not just a 20x jump. It was the market deciding this was no longer a Harvard novelty. It could replicate across the U.S. college system. The main asset supporting that re-rating was user-network expansion rather than revenue.

4、Stage three was 2006: from campus network to scalable internet utility.
Facebook’s official 2006 financing announcement disclosed $25 million led by Greylock, with Meritech, Accel, and Peter Thiel also participating. Later reconstructions from sources such as Business Insider and Fast Company commonly place this round around a $500 million valuation.
This re-rating reflected two things:
first, the product had outgrown local campus-network status and was replicating across the university system;
second, with News Feed, Facebook had begun turning into a high-frequency attention product rather than a static directory.
At this point capital began to price it more like a future internet entry point than a niche social startup.

5、Stage four was 2007: platformization plus big-tech validation took the company to a $15 billion scale on paper.
In October 2007, Microsoft announced a $240 million investment in Facebook at a $15 billion valuation, and Microsoft’s own release said Facebook had nearly 50 million active users.
This was Facebook’s first truly dramatic re-rating.
Why so high? Because investors were effectively buying three expectations at once:
first, Facebook Platform suggested the company might become the center of a developer ecosystem;
second, Microsoft’s strategic ad-sales partnership gave Facebook institutional credibility;
third, social advertising and highly targeted online ad markets still looked underbuilt, and Facebook seemed the strongest candidate to build them.
It is important, however, to note that the $15 billion figure carried strategic premium. Even at the time, some observers argued Microsoft was paying a defensive premium, not purely a financial one.

6、Stage five was 2008 to 2009: a crisis-era valuation cooldown, even as company quality improved.
After Microsoft’s investment, Li Ka-shing’s foundation invested across late 2007 and 2008, and Reuters reported these deals were done on the same $15 billion valuation framework. But by 2009, DST’s preferred-share investment implied about a $10 billion valuation, while Reuters separately reported that DST’s common-share purchases implied only about $6.5 billion for the common.
This is a crucial lesson. Facebook did not simply glide upward. It experienced a genuine partial deflation and re-calibration.
The reasons included:
the 2008 financial crisis reducing risk appetite;
the fact that social advertising still had not been fully validated;
and the large gap between preferred-share pricing and common-share pricing, showing that “valuation” is not one number but depends heavily on terms, liquidity, and security type.

7、Yet 2009’s cooler valuation did not mean the company had weakened. In some ways it meant that the valuation basis was shifting from pure story to revenue quality.
Facebook officially said in late 2009 that it had over 350 million users. Its S-1 later showed revenue of $777 million and net income of $229 million in 2009, revenue of $1.974 billion and net income of $606 million in 2010, and revenue of $3.711 billion and net income of $1.0 billion in 2011.
Once investors could see that Facebook was not just one of the world’s biggest social networks, but also a company with strong real profitability, the ground for the next re-rating was re-established.

8、Stage six was 2010: private secondary markets began repricing Facebook as a quasi-public asset.
During 2010 Facebook’s shares were traded actively in private secondary venues. Various media reconstructions based on SecondMarket / SharesPost trading implied valuations in the $25 billion, $34 billion, and $41 billion range at different points. Reuters later reported that Facebook requested a halt to secondary-market trading ahead of the IPO to reduce valuation churn as it approached pricing.
This stage mattered because Facebook stopped being priced solely by a few venture firms. Early employees, secondary buyers, early shareholders, and private-market intermediaries all began participating in price formation. That improved liquidity, amplified market heat, and raised regulatory questions about whether a “private” company at that scale should remain private in disclosure terms.

9、Stage seven was 2011: Goldman Sachs and DST pushed Facebook into the category of a private mega-cap.
In early 2011 Goldman invested about $450 million and DST another $50 million, putting Facebook at around a $50 billion valuation. Reuters also reported that materials Goldman sent to clients showed Facebook had generated about $1.2 billion in revenue and $355 million in net income in the first nine months of 2010. Reuters further reported that the materials suggested Facebook might exceed the 500-shareholder threshold, increasing pressure toward public disclosure.
Why was this re-rating so large? Because it reflected three forces combined:
real company growth and profitability sufficient to support a large-scale advertising-platform thesis;
private-market demand already heated by secondary trading;
and the arrival of a core Wall Street firm giving Facebook the status of a premier pre-public asset.

10、The final jump was the 2012 IPO.
Facebook priced its IPO at $38 per share in May 2012; Reuters and the Wall Street Journal both put the valuation at about $104 billion, with offering proceeds around $16 billion.
From roughly $5 million to roughly $104 billion, the path shows that social-network valuation is not built by revenue growth alone. It is built layer by layer through:
network expansion → product-form upgrade → platformization → monetization validation → private-market liquidity premium → public-market convergence.

The real drivers behind the re-ratings
1、The first driver was network effects, specifically real-identity network effects.
One of Facebook’s major differences from MySpace was its early commitment to real identity, campus networks, and real-world relationship mapping. In its S-1, Facebook repeatedly emphasized friend connections, the social graph, and people users care about. That is a clue to the core asset: not content alone, but the relationship graph itself.
Once the graph forms, switching costs, ad-targeting quality, and distribution efficiency all rise. That is the deepest reason Facebook could be repeatedly re-rated upward.

2、The second driver was the move from profile pages to feed-based consumption.
Without News Feed, Facebook would have remained more of a directory utility. With News Feed, it became a daily-consumption media product.
For capital markets, the valuation ceiling for a directory-style product is far lower than the ceiling for a feed product, because the latter continuously creates new impressions, engagement moments, and ad slots. Facebook’s 2006 Feed transition effectively lifted its valuation framework.

3、The third driver was platformization rather than single-feature productization.
After Facebook launched Platform in 2007, third-party developers could build inside its environment. The S-1 explicitly writes users, developers, and advertisers into the company’s own value-creation logic, and by 2011 Zynga alone represented about 12% of total revenue.
That means Facebook was already not just selling ads. It was also extracting value from payments and developer ecosystem activity.
Capital markets typically assign a higher multiple to ecosystem position than to a single standalone website.

4、The fourth driver was monetization proof, especially in advertising.
Facebook’s S-1 disclosed ad revenue of $764 million in 2009, $1.868 billion in 2010, and $3.154 billion in 2011. Advertising represented 98%, 95%, and 85% of revenue in those years respectively.
So by the time Facebook approached the IPO, it was no longer simply a company that “might one day monetize.” It had already demonstrated a functioning large-scale advertising machine. Once that happens, valuation can shift from user-story multiples to profit-story multiples.

5、The fifth driver was the arrival of Sheryl Sandberg, which helped turn Facebook from a product-genius company into a scalable revenue organization.
Facebook’s official 2008 announcement said Sandberg would become COO and oversee sales, marketing, business development, human resources, public policy, privacy, and communications. This executive move is often under-appreciated, but it was one of the key reasons the company became financeable at larger multiples after 2008.
Zuckerberg gave Facebook product direction. Sandberg helped build the advertising sales machine, organizational systems, and global operating capacity that made the business model durable.

6、The sixth driver was mobile—both as a threat and as an option.
The S-1 was very candid: Facebook had more than 425 million monthly active users accessing Facebook mobile products in 2011, yet the company directly generated no meaningful mobile revenue at the time, and explicitly listed mobile usage growth as a major risk.
On the surface that looked negative. But in valuation terms it had a double effect:
in the short run it prevented naive exuberance about business quality;
in the longer run it told investors that if Facebook cracked mobile monetization, a second major growth leg still remained.
That made Facebook simultaneously look like a mature profitable platform and a still-underexploited growth option.

7、The seventh driver was the control structure, which allowed investors to underwrite a long-duration story.
The final prospectus made this very clear: Class A carried one vote, Class B ten votes, and Zuckerberg would still control roughly 55.9% of voting power after the IPO.
For some investors that was a governance risk. But for investors willing to back long-run network dominance, it also reduced fear that the company would be forced into short-termism too early.
This was one of the structural reasons Facebook could sell the market on still-unfinished stories—mobile, global expansion, and platform evolution—at a very high valuation.

8、The eighth driver was the combination of private-market liquidity and regulatory thresholds.
Reuters reported in 2011 that Facebook could exceed the 500-shareholder threshold, and Goldman’s client-vehicle structure attracted regulatory scrutiny. Reuters then reported in 2012 that Facebook asked secondary-market intermediaries to stop arranging private share sales before the IPO.
This means Facebook’s final pre-IPO valuation spike was not just a reward for company excellence. It was also the product of an unusually crowded line of investors, too little private-market supply, rising disclosure pressure, and the market’s desire to own a premier private tech company before it crossed into public status.

Brands, assets, organization, business model, and key turning points
1、Facebook’s pre-IPO asset base can be divided into three layers.
The first layer consists of real operating assets: code, servers, data-center investment, ad systems, payments systems, and employee organization. The S-1 said Facebook had 3,200 full-time employees at the end of 2011 and significant capital commitments tied to data-center operations.
The second layer is platform assets: the social graph, News Feed, Platform, Pages, Ads, and Payments.
The third layer is influence assets: the Facebook brand itself and the market’s expectation that it had become a central internet gateway.
The first two layers monetize directly. The third is more of a valuation premium layer.

2、Pre-IPO, the valuation was not supported by a single “Facebook website” alone. It was supported by a whole product stack functioning as social infrastructure.
Major pre-IPO milestones included:
News Feed in 2006;
Platform in 2007;
Facebook Ads in 2007;
payments and game-related economics in 2009–2011;
large-scale mobile usage by 2011;
and the announced acquisition of Instagram in 2012.
Instagram was especially meaningful. Facebook announced in April 2012 that it would acquire Instagram for about $1 billion in cash and stock. This was only months before the IPO, and it sent a strong signal:
Facebook was not just the leader in social networking; it was willing to pay aggressively to secure the mobile future and neutralize emerging threats.

3、The business model evolution is also quite clear.
The earliest phase was mostly growth-first, monetize-later.
The middle phase introduced Pages, social ads, and display-based ad products.
The later phase developed two major revenue sources: advertising and payments / other fees collected from activity inside the platform, especially virtual goods.
The S-1 shows that payments and other fees revenue reached $557 million in 2011, much of it tied to gaming developers, and Zynga alone accounted for about 12% of total 2011 revenue.
So by the time Facebook went public, it was already not just an ad company. It was an ad company plus a platform-take-rate company—though advertising was dominant enough that the market still primarily valued it as an ad platform.

4、The most important decisions before the IPO can be summarized into six.
First, refusing to sell to Yahoo.
The exact internal details vary across sources, but the broad factual conclusion—that a roughly $1 billion 2006 Yahoo offer was rejected—is strong. The importance of that decision was not only that Facebook later became worth much more, but that it shifted Facebook from “hot acquisition target” to “independent category-defining company.”

5、Second, launching News Feed.
Short-term backlash, long-term information-distribution power and ad inventory. Without Feed, Facebook would have remained more of a social utility; with it, Facebook became a media-distribution platform.

6、Third, launching Platform.
This changed Facebook from a destination website into a foundational layer others wanted to build into. That moved the valuation logic from consumer-site logic to infrastructure-platform logic.

7、Fourth, hiring Sheryl Sandberg.
It was not flashy in the same way as product launches, but it helped convert a product-led startup into a scalable operational company. Capital markets usually pay higher multiples for the latter.

8、Fifth, building dual-class shares and voting agreements.
The final prospectus gave Zuckerberg 55.9% voting power after the IPO and disclosed voting agreements with certain shareholders. This let Facebook continue to raise money, offer employee liquidity, and bring in outside investors without fully dispersing control.
For a social-network company that still required long-duration product bets, that mattered enormously to how the market valued future optionality.

9、Sixth, acquiring Instagram just before the IPO.
This was not the direct source of Facebook’s pre-IPO valuation, but it strengthened two expectations:
that Facebook could neutralize emerging mobile threats before they became existential;
and that it was willing to spend aggressively to secure the next product epoch.
That helped the IPO narrative.

Outcomes, controversies, present-day position, and final conclusion
1、If one asks what Facebook’s greatest pre-IPO success really was, the answer is not simply “big user numbers” or “a high valuation.”
Its deeper achievement was that it transformed social networking from a website category into a foundational way of organizing the internet.
Before Facebook, social networking was more about personal pages, comments, and community spaces. After Facebook, the internet increasingly reorganized itself around identity graphs, activity feeds, social recommendation, targeted advertising, and platform integration.
That is why Facebook is remembered not only as a giant company, but as a company that defined the dominant product architecture of much of the mobile internet era.

2、Its pre-IPO financial outcomes were also strong enough to support that story.
The S-1 showed that in 2011 Facebook had 845 million monthly active users, 483 million daily active users, $3.711 billion in revenue, and $1.0 billion in net income. Ads were dominant, but platform-related fee streams were already meaningful.
This means Facebook did not go public merely on hope. It went public on top of very strong real growth plus real profit. That was one of the basic reasons it could command a $104 billion valuation.

3、But Facebook’s controversies also began very early, and many were not later deviations but extensions of its early DNA.
The major areas of controversy cluster into four categories:
first, origin disputes, including legal conflict around ConnectU / the Winklevoss brothers, which Reuters reported ended in a stock-and-cash settlement in 2008;
second, co-founder equity disputes, especially Eduardo Saverin’s dilution and later settlement;
third, privacy and product-boundary conflicts, from Facemash to the News Feed backlash to Beacon and the FTC’s 2011 privacy allegations;
fourth, later large-scale data and societal controversies, especially Cambridge Analytica and the regulatory / litigation wave that followed.

4、It is especially important to note that Facebook was already under FTC scrutiny before the IPO.
The FTC’s 2011 announcement said Facebook had deceived consumers by promising privacy control while repeatedly making information more public, and the FTC finalized the settlement in 2012.
So even as Facebook approached public-market mega-cap status, regulators had already identified its core institutional risk:
its growth engine often depended on pushing users toward expanded sharing, while privacy promises and user control mechanisms lagged behind.
That explains a great deal about the company’s later repeated collisions between growth and governance.

5、Those controversies later grew even larger.
In 2019 the FTC imposed a $5 billion penalty and extensive privacy restrictions. Reuters reported in 2022 that Meta agreed to pay $725 million to resolve user litigation related to Cambridge Analytica. Reuters also reported in 2025 that current and former executives and directors reached a settlement to end an $8 billion shareholder case.
All of that came after the IPO, but it also confirms a backward-looking point:
Facebook’s early model of “connect first, grow first, fix governance later” was highly effective, but it also created enormous tail risk.

6、Facebook’s present-day position is no longer that of a standalone social website. It is one foundational component inside Meta.
Meta announced in 2021 that the corporate brand would change from Facebook to Meta, bringing Facebook, Instagram, WhatsApp, Messenger, Threads, and related technologies under one umbrella. Meta’s 2025 total revenue was about $200.97 billion, with virtually all core revenue still coming from the Family of Apps advertising business. In Q1 2026, Meta reported 3.56 billion Family daily active people.
That tells us two things:
first, Facebook as a standalone brand matters less than it once did, but as the historical and organizational core of the wider company, it still matters enormously;
second, the pre-IPO market thesis—that Facebook might become core global social infrastructure—was, in broad terms, substantially vindicated.

7、If the entire report were compressed into a single conclusion, it would be this:
Facebook was first valued as a high-growth campus relationship network, then as a global activity-feed gateway, then as a dual-engine advertising-and-platform infrastructure company, and finally as a super-platform approaching the public markets with founder control intact, profit already validated, and mobile upside still incompletely monetized.
Those stacked valuation frameworks are what pushed it from roughly $5 million in 2004 to roughly $104 billion in 2012.

8、For understanding why a social network can be repeatedly re-rated before going public, Facebook offers five major lessons.
First, early social-network valuation is driven more by network quality and growth speed than by revenue.

Second, once a product evolves from a utility into a feed, the valuation logic can step up sharply.

Third, once platformization and an external developer ecosystem emerge, valuation can move from “website multiple” to “infrastructure multiple.”

Fourth, once advertising monetization is validated, story-based valuation can become profit-based valuation.

Fifth, private secondary-market liquidity and control-structure design can materially affect the height and timing of the final pre-IPO valuation spike.

Condensed timeline
1、1984: Mark Zuckerberg is born in White Plains, New York.

2、2002: He enters Harvard and later builds CourseMatch and Facemash.

3、February 2004: TheFacebook launches in a Harvard dorm; later that year Peter Thiel makes the first outside investment.

4、2005: Accel invests about $12.7 million at roughly a $98 million valuation.

5、2006: The Greylock / Meritech round takes value to roughly $500 million; Yahoo is turned down; News Feed launches.

6、2007: Platform launches; Microsoft invests $240 million at a $15 billion valuation; Facebook Ads launches.

7、2008: Sheryl Sandberg joins and greatly strengthens operating and monetization capacity.

8、2009: DST invests $200 million at about a $10 billion preferred-share valuation; common-share trades imply around $6.5 billion.

9、2010: Secondary markets push Facebook into the tens of billions; private-placement materials reveal strong revenue and profit growth.

10、2011: Goldman Sachs and DST push valuation to roughly $50 billion; disclosure pressure rises around the 500-shareholder threshold.

11、April 2012: Facebook announces the $1 billion Instagram acquisition.

12、May 2012: Facebook prices the IPO at $38 per share, implying about a $104 billion valuation.

Public-information limitations
1、On the exact details of the 2006 Yahoo negotiations, boardroom tensions, and some founder-level internal disputes, the public record relies heavily on later recollections, interviews, and book-driven reconstructions. The broad conclusion is solid, but fine-grained details vary across sources.

2、On the exact point-by-point valuation figures from secondary private markets in 2010, second-market quotes were illiquid, security terms differed, and there were meaningful distinctions between common and preferred shares. The safest conclusion is: public materials are limited / definitions vary, but it is clearly confirmable that Facebook’s private-market valuation was being pushed into the tens of billions by 2010–2011.

3、On the precise role boundaries, equity evolution, and governance arrangements among all co-founders during 2004–2005, the public record is incomplete and not fully consistent. The major role allocations and the existence of later legal / equity conflicts are confirmable; finer detail is not fully confirmable from public sources.