China has become the world's largest smartphone market, with over 415 million smartphone users in 2013. WeChat has emerged as the dominant mobile messaging platform in China, surpassing Sina Weibo with over 300 million active users by early 2013. WeChat users tend to be younger and spend more time on the app than Weibo users. The document analyzes user demographics and behaviors on both platforms and how Chinese consumers are increasingly using WeChat to communicate with brands.