A social network that ballooned

(PhysOrg.com) -- On Tuesday, Dec. 1, members of the MIT Media Lab`s Human Dynamics Laboratory received an e-mail with a $40,000 proposition. The U.S. Defense Department`s Defense Advanced Research Projects Agency (DARPA) was holding a competition that weekend: on Saturday morning, 10 large red weather balloons would be raised at undisclosed locations across the United States; the first team to use social media - like online social networks and communication systems - to determine the correct latitude and longitude of all 10 would receive $40,000.

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