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On Your Mark, Get Set, Hack!

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TechCrunch hackathon

Attendees gathered at a TechCrunch hackathon in San Francisco on Sunday.

Credit: Getty Images

During a "hackathon" last year, GroupMe co-founders Steve Martocci and Jared Hecht built a group text-messaging service in one 24-hour stretch. In August, the co-founders sold GroupMe to Skype for around $80 million.

From The Wall Street Journal
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