The trend started as a form of empowerment, a way for people to feel sexy and good in their bodies. But because everything is terrible, some people have found a way to turn a feel-good trend into depraved gratification.

There are now many videos on YouTube instructing people how to use editing software or apps to change the contrast and color in a way that reduces the silhouette effect. Because participants are just a silhouette in the challenge, many are wearing less clothing, or lingerie, or nothing at all. The goal of the editing is to reveal their bodies.

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TikTok's pledge to take "immediate action" against child predators has been challenged by a BBC Panorama investigation.

The app says it has a "zero tolerance" policy against grooming behaviours.

But when an account created for the programme - which identified itself as belonging to a 14-year-old girl - reported a male adult for sending sexual messages, TikTok did not ban it.

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TikTok has admitted censoring posts by users it identified as disabled, fat or LGBTQ+ as part of a misguided effort to cut down on bullying on the platform.

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Video-sharing app TikTok is failing to suspend the accounts of people sending sexual messages to teenagers and children, a BBC investigation has found.

Hundreds of sexually explicit comments have been found on videos posted by children as young as nine.

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