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Dressed in his usual attire of jeans, a fleece vest and Adidas sandals, Mark Zuckerberg looks as if he would be more at home stalking the halls of a college dormitory after a late-night coding session than at the helm of the internet's next multi- billion-dollar company.

Yet at just 23 years old, the founder and chief executive of Facebookis being hailed as a potential new internet mogul. Reports this week that Microsoft – and possibly Google – are mulling an investment that could value Facebook at $10bn, are an astonishingly rapid endorsement for the fast-growing social network Mr Zuckerberg launched from his Harvard dorm room four years ago. With daily visitor numbers on Facebook having overtaken those on Ebay, some observers have drawn comparisons with Steve Jobs, the mercurial chief executive of Apple, and Bill Gates, chairman of Microsoft. Indeed, it is from this older generation that Mr Zuckerberg has drawn inspiration.

Born and raised just north of New York City in the exclusive Westchester County suburb of Dobbs Ferry, Mr Zuckerberg was the second of four children and the only son of a dentist and a psychiatrist. He displayed an early aptitude for computers and got his first computer when he was 10; by high school he was writing his own programmes, such as a version of the board game, Risk.

After graduating from Phillips Exeter Academy, an elite New Hampshire boarding school, he enrolled at Harvard in 2002, where he planned to focus on psychology. In 2004, he launched Facebook as a networking tool for Harvard students. Within the year it had spread to hundreds of colleges and universities. It then expanded to high schools and companies. The site now has nearly 40m users – with new registrations doubling about every six months.

Even in those early days, Mr Zuckerberg exhibited that rare blend of technical prowess, self-confidence and ruthlessness found in successful technology entrepreneurs. In 2003, he was hauled before Harvard authorities after hacking into a university database to get photos of students for use on a website he had designed to allow classmates to rate each other's attractiveness.

Later that year, Mr Zuckerberg helped briefly with a social website being designed by some fellow Harvard students. After a few months he drifted away from the project, only to emerge the following year with Facebook.

As Mr Zuckerberg's creation became a runaway success, his former collaborators accused him of stealing their idea – a charge Mr Zuckerberg has denied. They filed a complaint with Harvard authorities. The ensuing drama, detailed in the pages of The Harvard Crimson and other student papers, made it to Lawrence Sum- mers, then Harvard's president. When he declined to intervene, Mr Zuckerberg's former collaborators filed a lawsuit that is still being pursued in the courts.

By that time, Mr Zuckerberg and two partners had moved their growing operation from Cambridge, Massachusetts, to Palo Alto, California, where they ran it from a sub-let apartment. There, a chance encounter with a co-founder of Napster (whom they let crash in their flat), helped them land a meeting with Peter Thiel, a Valley financier and co-founder of PayPal, the online money-transfer system. Mr Thiel eventually became Facebook's first investor, contributing $500,000 to get it off the ground.

Weighing on his decision to leave Harvard, as he told Forbes in 2006, was a talk Mr Gates gave in 2004 to his computer science class. “He really encouraged all of us to take time off school to work on a project. That's a policy at Harvard . . . Gates says to us: ‘If Microsoft ever falls through I'm going back to Harvard.'?”

The same self-assuredness that led Mr Zuckerberg to drop out and create Facebook was evident last year, when he walked away from what is understood to have been a $1bn buy-out offer from Yahoo, the internet portal.

Many observers were incredulous that Facebook's young and relatively inexperienced founder would make that choice. A year earlier, Rupert Murdoch had bought MySpace, a rival whose audience even today remains bigger than Facebook's, for $580m.

A year later, in May, Mr Zuckerberg announced plans to turn Facebook into a platform for launching internet applications – a move some contemporaries likened to Mr Gates's strategy of turning the Windows operating system into the dominant platform for desktop computers. The aim is forFacebook tobecome the main platform for internet users to accesssocial applications. In his presentational style, Mr Zuckerberg has looked to mimic the self-assured swagger of Mr Jobs. His unveiling of Facebook's strategy in front of an audience of 800 developers was polished and used catchy graphics, but still showed the nervousness that might be expected of a 23-year-old pitching a new idea.

Mr Zuckerberg remains, above all, a geek's geek, interested more in Facebook's technological and social potential than in its ability to turn him into a billionaire (as recently as May he was still living in rented accommodation with a mattress on the floor). His desk at Facebook's headquarters is next to engineers who work the late-night coding shift, and he often works through the night with them. He continued to write code for the site long after most chief executives would have delegated such responsibilities. It took Facebook's venture backers to convince him to stop coding and focus his full attention on running the business.

Even so, Mr Zuckerberg has shown maturity to carry through his vision, even when it meets resistance from older, more experienced advisers. He recently eliminated a dual-reporting arrangement whereby half the company's top managers reported to another executive. Now the top seven managers report to him. Mr Zuckerberg keeps close counsel with Adam D'Angelo, a school friend and accomplished coder who is now Facebook's chief technology officer.

Mr Zuckerberg can sometimes come across as awkward, but he “leads on open ambition and complete and utter confidence in what he is doing”, says one person close to the company.

With Facebook generating revenues of just $150m last year, comparisons between Mr Zuckerberg and Mr Gates or Mr Jobs seem premature. The site remains, in the words of Kara Swisher of The Wall Street Journal, a “lemonade stand” compared with a giant such as Google. Internet users are fickle. Things could fall apart. Yet, as he joked in 2006, “I always say, if Facebook ever falls through, I'll consider going back to Harvard.”