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Actually Douyin (the original/chinese version of tiktok) launched in 2016
Then Tiktok (the international version) launch in 2017, and acquired Musical.ly in late 2017.
It was pretty big in late 2018, I don't think people realize how big it was/has gotten.
- Reddit MAU = 330m
- Twitter MAU = 330m
- Twitch MAU = 140m
- Titkok MAU = 850m
- (and remember, that's not including Douyin, which has an INSANE 600m DAILY active users)
I wouldn't be unreal that if you consider both Tiktok and Douyin as the same app/platform, they have more global MAU than Reddit, Twitter, and Twitch combined.