Paul Mozur: China is cutting edge in mobile tech

Snapchat and Kik, the messaging services, use bar codes that look like drunken checkerboards to connect people and share information with a snap of their smartphone cameras. Facebook is working on adding the ability to hail rides and make payments within its Messenger app.

Facebook and Twitter have begun live-streaming video. All of these developments have something in common: The technology was first popularised in China. WeChat and Alipay, two Chinese apps, have long used the bar-codelike symbols - called QR codes - to let people pay.....

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