Facebook is expected to file as early as today to sell stock on the open market in what will be the most talked-about initial public offering since Google in 2004, maybe since the go-go 1990s.

Around the nation, regular investors and IPO watchers are anticipating some kind of twist - perhaps a provision for the 800 million users of Facebook, a company that promotes itself as all about personal connections, to get in on the action.

'Pandemonium is what I expect in terms of demand for this stock,' says Scott Sweet, senior managing partner at IPO Boutique, an advisory firm.

He added: 'I don't think Wall Street would want to anger Facebook users.'

The most successful young technology companies have a history of doing things differently.
Google's IPO prospectus contained a letter from its founders to investors that said the company believed in the motto 'Don't be evil.'

Facebook declined to comment, but Reena Aggarwal, a finance professor who has studied IPOs at Georgetown University's McDonough School of Business, believes the site's founder and CEO Mark Zuckerberg will emulate Google's philosophy, at least in principle.

A stock usually starts trading three to four months after the filing.

The highly anticipated filing will reveal how much Facebook intends to raise from the stock market, what it plans to do with the money and details on its own financial performance and future growth prospects.

Along with Wall Street investment banks, Google used a Dutch auction, named for a means of selling flowers in Holland, to sell its shares. 

It took private bids and allowed investors to say how many shares they wanted and what they were willing to pay.

Words from the boss: It's widely expected that Mr Zuckerberg will write an unconventional letter when Facebook makes its stock market debut.

The process wasn't smooth, though, and Google had to slash its expected offer price at the last minute.

If you bought at the IPO, for roughly $85 a share, you still did well: Google closed yesterday at $580.

More recently, when it filed for an IPO last June, Groupon, which emails daily deals on products and services to its members, added a letter from its 30-year-old founder, Andrew Mason.

'We are unusual and we like it that way,' the letter said. 'We want the time people spend with Groupon to be memorable. Life is too short to be a boring company.'

It's almost become conventional for tech companies to include an unconventional letter when they make their stock market debut. 

It's widely expected that Mr Zuckerberg, in the very least measure of showmanship, will write one.

But IPO watchers wonder whether there might be a provision specifically designed to give the little-guy investor, even the casual Facebook user who doesn't invest, a piece of the debut.

'There is a feeling that there will be something unique in store for Facebook users,' Ms Aggarwal sajd.

When most companies go public, they let Wall Street investment banks handle everything, with the sweet ground-floor stock price reserved for big institutional investors.

But that probably won't do for Facebook, created in a Harvard University dorm room eight years ago, or Mr Zuckerberg, whose anti-establishment credentials include spurning a $15billion takeover offer from Microsoft.