Most of the large online brokerage firms, including E-Trade, Fidelity and Charles Schwab, are allowing customers to request shares of the Facebook initial public offering. It's the latest phase in kicking off what's expected to be the largest technology IPO next week.

Given the large degree of attention on this IPO, though, investors shouldn't expect to actually get shares or make money on them. "I anticipate there to be many orders relative to the number of shares available to allocate," says Jay Ritter, professor of finance at the University of Florida.

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