How to Scale a Start-up Using Social Media

shutterstock images Eat24 is a Web and mobile food ordering service that's grown like crazy in the last few years. What started as two guys in a San Francisco apartment in 2008 has grown to 150 employees, 20,000 restaurants available in 850 cities, more than 1 million visits to its website a month, and a projected $150 million in sales this year.

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