The Blue Whale Challenge is an online game in which participants follow a social media account, which instructs them to complete 50 disturbing challenges. Challenges grow in their extremes; starting with watching a horror movie or listening to a particular song and develop into the participant live-streaming some form of self-harm.
This was a social media challange that has been around since 2016 and appears to be doing the rounds again. Please find a link to further information and some advice on how to talk to your child about this. Please ensure that you are talking to your child to ensure that they do not feel pressured to take on this challenge.