Think you’re safe being an anonymous TikTok troll or cyber bully? Think again.

The Great Londini could be your worst nightmare come true.

You might think you’re anonymous - but if you leave a threatening, racist or homophobic comment on someone’s video, Londini will find out who you are. If you’re a kid, he’ll contact your parents or your school. If you’re an adult, he'll really tell on you.

In just a few months, the mysterious online vigilante has gained a huge following for his efforts to clean up TikTok. Londini says he’s doing the job that the platform should be.

But does social media need moderation vigilantes - or are they a problem in themselves?