On the whole, users of WeChat show the characteristics of high education and youthfulness. The main social network of WeChat users is the "acquaintance network" based on mobile phone contacts and QQ friends, among which only 15 contacts are commonly used, accounting for 13.4% of all contacts, which reflects the "strong relationship chain" feature of small-scale interaction between users and contacts. According to the latest Statistical Report on Internet Development in China released by China Internet Network Information Center (CNNIC), as of 20 15 and 12, the number of Internet users in China has reached 8180,000, including 700 million mobile phone users, which has maintained a steady growth trend for many years. The continuous expansion of mobile phone users has promoted the development of mobile phone client applications, which has become a highlight of the Internet development in China in 20 15.