Canadian Facebook fans are unlikely to share in the excitement of the social media giant's hotly anticipated initial public offering.

That's because only the biggest Canadian players have accounts with the social media company's underwriters, who are responsible for doling out shares to investors.

Investment advisers usually receive fewer shares than they want of a stock that's in high demand. They then distribute whatever shares they get among their clients.

By the time Facebook shares actually hit stock exchanges, the price is expected to at least have doubled from the initial asking price.

Facebook hopes to raise about $5 billion US in its IPO when the company sells a small piece of its business to the public. The offering is expected later this year.

The entire California company could be valued at $100 billion US or even more, depending on the market reaction to its stock sale.

Facebook did not indicate an initial offering price, which will be determined by underwriters depending on the level of interest, but it has been estimated at between $30 to $35 per share.

That leaves about 167 million shares in circulation, which scarcely covers intense demand for the world's biggest social networking website.

"They're only going to give it to their biggest, best client and even they're going to get very, very small amounts," said John O'Connell, CEO at Toronto-based money manager Davis Rea.

Investment advisers, who usually receive fewer shares than they want of a stock that's in high demand, distribute those shares among their clients.

By the time Facebook shares actually hit the public stock market, in about three months, the price is expected to at least have doubled from the initial asking price — causing even more investors to want to jump on board.

"Nobody's going to get everything that they want, so some people will decide to flip it for a quick profit and some will decide to buy more," O'Connell explained.

Investors need to look beyond the hype and focus on whether the company's books justify its valuation.

O'Connell warns that traders have lost a lot of money by buying into similarly hyped public offerings that inflate stock prices at companies that later tanked.

"It's amazing that so many people want to buy this thing and they don't know anything about the company's financials — that says a lot about investors' thought processes."

"Some of these stocks change at huge, huge premiums initially and oftentimes they tend to drift lower over time because investors start taking a very sober second look at what the business is all about."

The regulatory filings showed what analysts have long suspected — that Facebook is very profitable and growing. The company Mark Zuckerberg started in a Harvard dorm in 2004 has seen its annual revenue soar from $777 million in 2009 to $3.7 billion last year. Facebook's earnings have grown at a similar rate too, ballooning from $122 million in 2009 to $1 billion last year.

Facebook ended 2011 with $3.9 billion in cash. That's a relatively small amount compared to the nearly $45 billion that Google has in the bank and peanuts compared to Apple's nearly $100-billion stockpile.

Facebook ended last year with 845 million users, up 39 per cent from 608 million at the end of 2010. The company generates about $4.39 in revenue per user.

Facebook is just the latest tech company to make an eagerly awaited IPO in the last year.

The early crop has included Internet radio service Pandora Media Inc., professional networking service LinkedIn Corp. and daily deals company Groupon Inc. Most of those Internet IPOs haven't lived up to their lofty expectations. The list of disappointments includes Zynga Inc., which has built a profitable business by creating a variety of games to play on Facebook. Zynga's stock fell five per cent below its IPO price on the first day of trading.