China, Not Silicon Valley, Is Cutting Edge in Mobile Tech

A cellphone user in Shenzhen, China. China’s tech industry has popularized some technologies that are just getting started in the United States.

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 popularized in China.

WeChat and Alipay, two Chinese apps, have long used the bar-codelike symbols — called QR codes — to let people pay for purchases and transfer money. Both let users hail a taxi or order a pizza without switching to another app. The video-streaming service YY.com has for years made online stars of young Chinese people posing, chatting and singing in front of video cameras at home.

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