"They are realising their window of opportunity, and they want to do it sooner rather than later."
At US$10 billion, the offering would raise more money than any other technology IPO, a sign Facebook expects investors to clamour for a piece of the social-networking company.
The amount would dwarf that of the previous record holder, Infineon Technologies, which generated US$5.23 billion in its 1999 debut.
Lise Buyer, principal of the Class V Group, an IPO advisory firm, said Facebook's IPO was far enough away that details might change.
"It's far too early to accurately predict where the valuation will be on deal day," she said.
Facebook said in January that it expected to be required by United States regulators to disclose financial results by April 30, 2012, if it did not go public by then.
The company decided to wait until 2012 for its IPO to give chief executive Mark Zuckerberg more time to gain users and boost sales, people familiar with the matter said last year.
Facebook, which boasts more than 800 million users, is also increasing its focus on mobile technology, aiming to take advantage of the shift to smartphones and tablets. The company expects its next one billion users to come mainly from mobile devices, rather than desktop computers.
Google, one of Facebook's chief rivals in the internet advertising market, raised US$1.67 billion in its IPO in 2004. It is now valued at US$190.4 billion.
Facebook's valuation is currently pegged at US$66.6 billion by SharesPost, which handles trading of privately held companies.
Demand for technology IPOs reignited in November after a lull, setting the stage for Groupon and Angie's List to go public.
Groupon, the largest provider of online coupons, has lost 24 per cent of its value since its debut at US$20 this month.
Groupon's decline might be spurring other companies to pursue IPOs before they lost the chance again, Schuster said.
"Groupon has lost a lot of steam and I believe bankers are saying, 'The market is still hot so let's do it right now."'
- Bloomberg