Meet TikTok’s Masked Vigilante, who has made it his mission to track down and expose online bullies, scammers and trolls. If you’re racist, sexist, or generally abusive he may have you in his sights. Known only as ‘Leo’, this anonymous TikToker founded The Great LonDini movement, a group of experts and volunteers who work to stop online harassment in its tracks. If you threaten someone, they could report you to your workplace, or the police. If you’re a kid, they’ll find your parents or your school. VICE World News talks to Leo about how he works to uncover posters’ identities, and why he does what he does. In our series Super Users, VICE World News explores the latest technology being used to fight crime, trafficking, climate change and social injustice. Watch more from this series: Uncovering Stories of the Dead on TikTok https://www.youtube.com/watch?v=qtJb10inTis My Nyan Cat Meme Sold For $590K https://www.youtube.com/watch?v=rU3SO_VOG8A “I Left Anonymous. Now I'm Back” https://www.youtube.com/watch?v=sNEA0sglO5A Click here to subscribe to VICE: http://bit.ly/Subscribe-to-VICE About VICE: The Definitive Guide To Enlightening Information. From every corner of the planet, our immersive, caustic, ground-breaking and often bizarre stories have changed the way people think about culture, crime, art, parties, fashion, protest, the internet and other subjects that don't even have names yet. Browse the growing library and discover corners of the world you never knew existed. Welcome to VICE. Connect with VICE: Check out our full video catalog: http://bit.ly/VICE-Videos Videos, daily editorial and more: http://vice.com/ More videos from the VICE network: https://www.fb.com/vicevideo Click here to get the best of VICE daily: http://bit.ly/1SquZ6v Like VICE on Facebook: http://fb.com/vice Follow VICE on Twitter: http://twitter.com/vice Follow us on Instagram: http://instagram.com/vice The VICE YouTube Network: VICE: null MUNCHIES: null VICE News: null VICELAND: null Broadly: null Noisey: null Motherboard: null VICE Sports: null i-D: null Waypoint: null