Weixin is the domestic mainland China version of WeChat, China's most popular messaging application and super-application developed by Tencent Holdings (WeChat refers to the overseas version of the application). Weixin and WeChat are considered to be separate legal entities and there are some differences in terms of the functionalities available across the two versions as a result of the regulatory differences between China and abroad, although the two terms are frequently used interchangeably. We use the terms Weixin and WeChat interchangeably in our articles unless explicitly stated.