原文：
HONG KONG — 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.
Silicon Valley has long been the world’s tech capital: It birthed social networking and iPhones and spread those tech products across the globe. The rap on China has been that it always followed in the Valley’s footsteps as government censorship abetted the rise of local versions of Google, YouTube and Twitter.
But China’s tech industry — particularly its mobile businesses — has in some ways pulled ahead of the United States. Some Western tech companies, even the behemoths, are turning to Chinese firms for ideas.
“We just see China as further ahead,” said Ted Livingston, the founder of Kik, which is headquartered in Waterloo, Ontario.