The video-sharing app TikTok has taken the teenage world by storm. But where there are kids, there are also predators.

We found dozens of adults using TikTok to post sexual comments on videos uploaded by teenagers and children. TikTok, which has 500 million users worldwide, says it is working hard to protect its users from inappropriate approaches. But a BBC Trending investigation exposed some worrying shortcomings in the way it deals with the problem.

Presenter: Mike Wendling

Reporter: Marco Silva

(Photo: TikTok logo. Credit: TikTok)