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'When Online Gambling Is Legalized, Facebook Will Be A $100 Billion Company' | Business Insider:

At a party this evening in Munich, an industry insider close to Facebook made the following prediction: "When online gambling is legalized, Facebook will be a $100 billion company." 

That's $100 billion of revenue, not $100 billion in market value (Facebook's already close to the latter.) For context, Google is a $40 billion company. And Facebook did about $4 billion of revenue last year.