Insiders at Facebook are selling stock in the social networking company, and the prices they're getting for their shares suggest the sky-high valuation backers once placed on the company may prove unrealistic.

Just a few months ago, Facebook was widely viewed as the next Google (GOOG) in Silicon Valley. Microsoft (MSFT) bought a small equity stake last October that implied a valuation of $15 billion for the whole company. Shareholders in the still-private company appeared to be setting themselves up for a blockbuster initial public offering.

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