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SAN FRANCISCO: Facebook's debut on Wall Street will make 27-year-old co-founder Mark Zuckerberg a multi-billionaire with firm control of the world's leading online social network.

After Facebook's initial public offering of stock, Zuckerberg will own 57.3 percent of the hot Silicon Valley company in a stake valued at more than $15 billion based on how shares are expected to perform.

“Because Mr. Zuckerberg controls a majority of our outstanding voting power, we are a 'controlled company' under the corporate governance rules for NASDAQ-listed companies,” Facebook said in an amended filing with the US Securities and Exchange Commission (SEC).

Zuckerberg will immediately sell 30.2 million shares, with a projected value of about $1.05 billion, with the bulk of the money going to pay taxes on 60 million shares he will be acquiring for a pittance by exercising stock options.

Facebook employees and investors are expected to cash-out to the overall tune of $5.5 billion by selling stock when the company begins trading on the Nasdaq in a debut slated for May 18.

A regulatory filing calls for shares to be priced between $28 and $35, which would set a company value below some estimates of $100 billion for the world's biggest social network.

At the midpoint of the price range, the sale of 337 million shares would generate $10.6 billion, making Facebook's offering the largest IPO of a tech firm and one of the biggest on US soil.

“Facebook was not originally founded to be a company,” Zuckerberg said in a letter included in SEC paperwork.

“Most great people care primarily about building and being a part of great things, but they also want to make money,” he continued.

“Simply put: we don't build services to make money; we make money to build better services.”A video released as part of a 'roadshow' to woo investors featured Zuckerberg casually discussing Facebook and its vision.

“In middle school I used search engines like Google and Yahoo! and I just thought they were the most amazing thing,” Zuckerberg said.

“The thing that seemed like it was missing was always just people,” he continued.

“The most interesting stuff that you care about the most is actually what's going on in the lives of your friends, or the people around you.” Facebook's stock market debut will be the latest chapter in the life of the New York-born computer prodigy who has become a Silicon Valley legend.