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Dennis Crowley announces Foursquare partnership with Snapchat

Foursquare Chairman Dennis Crowley

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Luis Von Ahn, founder of CAPTCHA and Duolingo, says many of the society's big problems can be solved through crowdsourcing

Cheddar Research - Data & Insights Behind Industry Trends • 8m 57s

Luis Von Ahn - Founder of CAPTCHA and Duolingo

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