When you're sitting on a bus or train and watching people with their heads in their phones, there's a fair chance many of them are watching videos on TikTok. 

The platform, owned by Chinese company ByteDance, is currently the most downloaded app in the world, and nations including the US are increasingly worried about how its algorithm works, and where all the data it's collecting might end up. 

Today, tech and privacy reporter for Vox.com, Sara Morrison, on the TikTok bans sweeping the world. 

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Sara Morrison, senior reporter, Vox.com