This Meyou also support voice chat, text chat, picture sharing and so forth. But it support only iPhone 4S/4/3GS, not support Android devices at this time. Sina already provide this iPhone apps in App Store.
WeChat that is provided by Tencent already have over 100 million users, and they already provide not only client for iPhone, but also client for Android, Windows phone and Symbian devices.
So how Sina will fight to WeChat or other competitor, we have to keep attention to their action as ever.
Source => Meyou