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People use their mobile devices in a metro station in Shanghai on March 12, 2014. WeChat has taken China by storm in just three years, allowing its more than 300 million users to send text, photos, videos and voice messages over smartphones, find each other by shaking their devices -- a common dating technique -- and even book and pay for taxis. AFP PHOTO/Peter PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)
People use their mobile devices in a metro station in Shanghai on March 12, 2014. WeChat has taken China by storm in just three years, allowing its more than 300 million users to send text, photos, videos and voice messages over smartphones, find each other by shaking their devices -- a common dating technique -- and even book and pay for taxis. AFP PHOTO/Peter PARKS (Photo credit should read PETER PARKS/AFP/Getty Images)

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