Hong Kong superstar Andy Lau Tak Wah's latest online concert on ByteDance-owned short video service Douyin has set a record 350 million viewers, as it swept the platform's mainland Chinese users on a wave of Canto-pop nostalgia. The two-hour concert was live-streamed on Saturday (Sept 3) evening by Douyin, the Chinese sister app of TikTok, initially attracting about 100 million.