Foursquare, Gilt Groupe, Airbnb are all startups that have made it big, but are they actually profitable?

Every month or two, another tech startup enters the billion-dollar club.

News stories dutifully report the amount of the round and the names of the investors, along with the new valuation number.

But a lot of times, a more fundamental question is left unanswered: How do these companies actually make money? Do they make money? Matt Rosoff/The Atlantic.

Image via Newsweek.

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