【正确答案】WeChat, the hottest social information platform at present, is a kind of free app to provide instant messaging for intelligent terminals. It supports both one-player and multiplayer participation. People can send voices, pictures, videos and words through mobile network. WeChat has covered more than 90% of the Chinese smart mobile phones by the end of the first quarter of 2015, and has 549 million monthly active users coming from over 200 countries with more than 20 kinds of languages. What's more, the total of WeChat public accounts with various bands is more than 8 million, and the number of WeChat payment users has reached 400 million or so.