FAO Parents & Carers - Reddit

Reddit describes itself as a ‘social news’ site where users connect and share stories, opinions and support; debate issues; ask questions; and chat to people with similar interests. Discussion topics are organised into communities (known as subreddits) that are created, run and populated by users, who remain anonymous throughout.

In the guide, you'll find tips on a number of potential risks such as harassment, trolling and fake news. 

This guide plus many more are in the e-safety section of the website:

E-Safety - Parent Guides