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Before TikTok, it was called Douyin. It was originally named A.ME, but it was renamed a few months later in December 2016.
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It merged with another Chinese social media service called Musical.ly
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So people can 'reply' to a video content with their own videos
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It allows creators to live-stream to fans like YouTube and Twitch
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It allows users the ability to clip and integrate scenes from another users' video into their own