The document discusses the top 6 communication apps: WhatsApp, Facebook Messenger, WeChat, Tencent QQ, Telegram, and Snapchat. It provides brief descriptions of each app, highlighting their key features and functions. WhatsApp allows messaging, calls and media sharing and has over 1 billion users. Facebook Messenger allows chatting within Facebook. WeChat is popular in China and useful for communication, shopping and travel. Tencent QQ offers text, video chat and integrated apps. Telegram has security/privacy features and public/private groups. Snapchat focuses on ephemeral photo/video sharing.