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Douyin is a mix of lots of things but you barely realize that. It has one main surface - the feed. IG on the other hand, feels like several unrelated things stitched together

It is not part of the core UX.

TikTok or Doubin, just swipe up/down would be enough for 90% of your input

Doesn't douyin also have a very different demographic than TikTok though? I think their audience is much older in China.