Too many issues relating to social media and online use are being brought in to school. Please be reminded that age restrictions for lots of popular sites begin at 13 years old.
Below is the link to the NSPCC website which includes tips and ideas about keeping children safe online.
https://www.nspcc.org.uk/keeping-children-safe/online-safety/
https://www.nspcc.org.uk/keeping-children-safe/online-safety/social-media/
The attached poster from Coventry is also useful for understanding for understanding the risks associated with YouTube.
https://www.coventry.gov.uk/downloads/file/37534/youtube-guidance-for-parents-and-carers