Facebook, Twitter try to make mobile pay

Cbsnews: (MoneyWatch) Facebook (FB) has a little problem that it shares with many would-be giants of mobile computing: How do you make money?

That challenge -- and the fundamental questions it raises about the social network's future as a business -- is at the heart of the company's botched IPO and the reason it has lost more than 45 percent of its market capitalization since the May 18 offering.

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