F2 Freestylers' YouTube safety top tips
YouTube is for everyone but it's important to know how to stay safe.
The NSPCC, a charity which helps to protect children, ran a conference in London about keeping safe on YouTube and dealing with negative comments.
F2 Freestylers Billy Wingrove and Jeremy Lynch, popular for their football tricks and skills videos, spoke at the conference.
Watch them give Newsround five top tips for staying safe on YouTube.