Facebook shares down nearly 50 percent. Set for another fall?

You bought Facebook (FB) stock during its May initial public offering at $38? Too bad. It closed at $20.38 Tuesday, its second-lowest close ever and a 46 percent drop in 12 weeks.

But far worse is yet to come. This stock is worth no more than $7.30 a share and the really big sell-off could start as soon as this Thursday.

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