WeChat is a mobile social network application with more than a billion users. Developed by Chinese technology giant Tencent, it is the Chinese version of WhatsApp and the most popular instant messaging service in China. Users can send voice messages, photos, videos and text messages, make audio and video calls, chat in groups, and share their real-time location with friends. Users can also post updates, photos or videos on the app's social function, or 'pengyouquan'. WeChat Pay is also one of the top online payment options in the world.