How Google and Facebook Design for Emerging Markets

Facebook, which counts about half the Internet-connected population as users, spent the last year adding ways for advertisers to reach consumers as they spend more time on wireless devices than desktops. Photographer: Andrew Harrer/Bloomberg

One of the first directives from Matias Duarte after he joined Google in 2010 was to commission research into how people around the world use the company's phones.

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