According to “All About WeChat“, a blog on marketing and usage of WeChat, top viewers are coming from Malaysia and the United States.
We can explain Malaysia for the growing usage: over than 1 million people are using the application.
The United States position is mainly explained by business interests. Followers of social media are numerous and are looking carefully at the Chinese market. In 2012, WeChat was growing faster than Facebook.
Source of image: All About WeChat
As a reminder, Whatsapp is still the #1 messaging app in the United States (if we consider Facebook is not only a messaging app).