This programme looks at the effects that online bullying can have on children up to and including suicide. Please be advised thar it contains an interview with the mother of a a schoolgirl who took her own life, so is pretty upsetting:
https://www.bbc.co.uk/programmes/m001wjb1
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The rise in social media threats to players & their families has prompted the Premier League to set up a unit to track down internet trolls. A 19 year old man has already been charged with harrassment:
https://www.bbc.co.uk/news/uk-68293359