By the middle of 2003, Google had solved the problem that once threatened its survival. AdWords Select had turned search into a cash machine, and revenue was climbing toward $1.5 billion for the year. But Larry Page and Sergey Brin's ambitions had never stopped at the edge of Google.com. There was a far larger territory just sitting there, unclaimed: the rest of the web. Every blog, every hobbyist fan page, every small news site was covered in words — and words, Google had learned, could be matched to ads. The question was whether Google could plant its auction on land it didn't own.
The Company That Already Owned the Name
The answer arrived, as it often did, through an acquisition. In April 2003, Google bought a small Santa Monica company called Applied Semantics for roughly $102 million in cash and stock. Applied Semantics had begun life in 1998 as Oingo, founded by Gil Elbaz, his brother Eytan, and Elbaz's Caltech classmate Adam Weissman. Its specialty was teaching software to understand the meaning of text — a technology it called CIRCA, built on a hand-crafted map of how words and concepts relate. A page about "jaguars" could be sorted, correctly, into cars or cats.
Here is the detail history loves: Oingo had already built a product to monetize that understanding, and back in December 2000 it had given that product a name. The name was AdSense. When Google acquired Applied Semantics, it didn't just buy the technology and the more than forty engineers who became "Google Santa Monica" — it inherited the brand it would make famous. Gil Elbaz stayed on as an engineering director until 2007 and kept building the very system he'd started years earlier.
Contextual Advertising: Reading the Page
The idea behind AdSense was deceptively simple and, in execution, quietly radical. A website owner — anyone, from a tech blogger to a fly-fishing enthusiast — pasted a short snippet of JavaScript into their pages. Google's software would then read the content of each page, work out what it was actually about, and serve the most relevant ads from its existing pool of AdWords advertisers. A cooking blog got ads for knives and spice racks; an article about mortgages got ads for lenders. When a visitor clicked, the advertiser paid, and Google split the money with the site's owner.
This was a different beast from search advertising. On Google.com, a person told you what they wanted by typing a query. On a random web page, nobody had searched for anything — the intent had to be inferred from the surrounding words. That is precisely the problem Applied Semantics had spent five years solving. Google formally launched the content-targeting service on June 18, 2003, pairing it with a companion product, AdSense for Search, that let sites host a Google search box and share in the ad revenue those searches produced.
An Economy for the Long Tail
What AdSense really did was democratize the ad business. Before it, only large publishers with dedicated sales teams could sell advertising; a personal site had no way to make a cent from its traffic. AdSense handed a self-service revenue stream to millions of small publishers who could never have negotiated with an advertiser directly. Sign up, drop in the code, and checks started arriving. For a wave of early-2000s bloggers and niche site owners, AdSense was the first proof that a hobby on the web could pay the rent.
It also completed a strategic circle for Google. AdWords had a growing crowd of advertisers with money to spend; AdSense gave those advertisers a vastly larger canvas than Google's own results pages. Google's timing was uncanny: just months earlier, in February 2003, it had also acquired Pyra Labs, the maker of Blogger, helping ignite a publishing boom that would produce exactly the kind of content-rich pages AdSense fed on. The advertiser network and the publisher network grew together, each making the other more valuable.
The Empire's Second Engine
The financial impact was enormous and lasting. AdSense became the core of what Google reported as its "Network" revenue — money earned on other people's websites rather than its own. For years it accounted for a substantial slice of the company's total income; as late as the first quarter of 2011, Google disclosed that AdSense drove about 28% of its revenue, some $2.34 billion in a single quarter. The founders who in 1998 had warned that ad-funded search would corrupt results had now built two advertising engines — one on their search page, one across the entire internet.
There was a cost that would surface later. Contextual advertising meant Google's systems were reading the content of pages all across the web, and the model's hunger for ever-better targeting would eventually collide with rising worries about privacy and Google's sheer reach. But in 2003, that reckoning was years away. What mattered then was that Google had figured out how to turn the whole web into ad space — and how to get paid every time anyone, anywhere, clicked.
Next time: with two money machines humming, Google prepares to do the one thing Wall Street had been waiting for — go public, on its own defiant terms.
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