Following the Parents' Online Safety training, you may find the information useful by the NSPCC/O2:
https://www.nspcc.org.uk/preventing-abuse/keeping-children-safe/share-aware - Useful videos and tools for parents to use to engage their children in discussions about online safety.
https://www.net-aware.org.uk – tool for parents to find out about latest app and social media sites.
Other sites you may find useful:
Please see the images below offering important information about online apps. You are able to download these as a PDF.