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I wonder how much the American TikTok app is based on Musical.ly? 50%? More or less?

At current point, around 0%. TikTok simply absorbed the idea and the users.

By the way, according to your post history, I believe the following fact would be interesting for you: Musical.ly is a 100% Chinese app [1] with their HQ in Shanghai.

[1] https://en.wikipedia.org/wiki/Musical.ly

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