The following video is part of our nationally syndicated Motley Fool Money radio show, with host Chris Hill talking with Ron Gross, James Early, and Joe Magyer. With the IPO just hours away, the guys analyze Facebook's next big revenue stream and some of the big questions facing the company. Should it spend some of its IPO cash going after a premium video-streaming service like Hulu or Netflix? Is Apple or Google a bigger competitive threat? And what's the most important metric investors and Wall Street should be watching in this new-age technology giant?

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