What is the blue bubble behind the WeChat group?

Time video. As long as a friend posts a moment video, there will be a blue bubble in the upper right corner of the friend's avatar in the address book, circle of friends, single chat and group chat. Click on the blue bubble to view the recorded video. Wechat is a free application launched by Tencent on 2011121,which provides instant messaging service for intelligent terminals. It was created by the product team of Tencent Guangzhou R&D Center led by Zhang Xiaolong.