WeChat was being used by 335 million users a month throughout Q4 2013 according to a report published by its parent company, Tencent.
If accurate, those figures mean that WeChat has seen its user base increase by 121 percent year-over-year, and 6 percent quarter-over-quarter.
In the same quarter Tencent's other flagship social products, QQ IM and Q-Zone, had 808 million and 625 million monthly active users respectively.
This is important as both platforms are now key social networks for mobile gaming.
"During 2013, we achieved sustained growth in revenue and earnings, while further embracing mobile internet and starting mobile monetization," said Mr. Ma Huateng, Chairman and CEO of Tencent.
"[We] enhanced our market-leading Weixin/WeChat app from a communications tool to a multi-functional platform, through initiatives such as smart phone games, Official Accounts, and Weixin Payment.
"We will further expand our mobile leadership via app distribution and O2O services; invest in long term opportunities such as online video, online payment and WeChat international expansion."