https://www.reuters.com/article/us-china-tech-bytedance/chinas-bytedance-launches-video-chat-app-moves-in-on-tencents-turf-idUSKCN1P910I >China's ByteDance Technology unveiled a new video messaging app called Duoshan, a move which analysts say will see it muscling into a space dominated by Tencent's WeChat messenger.