Silicon Valley in California has long been the world's tech capital, being home to many of the world's largest high-tech corporations and thousands of startup companies. However, it might be argued that in recent years, elements of China's tech industry have pulled ahead of the United States, and nowhere is this more true than in the fields of mobile and internet technology.Chinese apps such as Wechat and Alipay popularised the use of QR codes to allow users to pay for purchases and transfer money. Consequently, more people use mobile technology to purchase goods and services in China than in any other country. Additionally, the multi-functionality of Wechat far outstrips that of US rivals such as Whatsapp and Snapchat.So how will the increasing use of mobile technologies affect society as a whole? To what extent is China leading the way in the global tech industry? And what problems and challenges does China's tech sector still have to overcome? These questions and much more on this edition of Today, where we'll be discussing the rise of mobile and internet technologies in China.