The encouragement of self-harm will be criminalised in an update to the Online Safety Bill, the government has said. Content that encourages someone to physically harm will be targeted in a new offence, making it illegal.
The government said the changes had been influenced by the case of Molly Russell - the 14-year-old who ended her life in November 2017. Culture Secretary Michelle Donelan said she was strengthening the bill "to make sure these vile acts are stamped out".
"I am determined that the abhorrent trolls encouraging the young and vulnerable to self-harm are brought to justice," she said. Molly Russell, from Harrow in north-west London, took her own life after viewing suicide and self-harm content on Instagram and Pinterest.
Her father has previously criticised delays to the Online Safety Bill and called for online platforms to stop self-regulating their content. At the inquest, the coroner concluded the schoolgirl died while suffering from the "negative effects of online content".
In October, Coroner Andrew Walker wrote to social media firms and the government to call for changes including separate platforms for adults and children.
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Ms Donelan said that social media firms could no longer be silent bystanders and they would face fines for allowing this abusive and destructive behaviour to continue. She said the update to the Online Safety Bill would create a new offence, bringing self-harm content in line with communications that encourage suicide - which is already illegal.
The amendment would mean social media platforms would be required to remove self-harm content and any person found to have such content would face prosecution. More details about the maximum penalty would be published in due course, the government said.
The NSPCC's Richard Collard said that it was good news the government was recognising the dangers of children being exposed to online content promoting self-harm. But he said a culture of compliance and accountability from technology firms that have allowed this type of content to spread like wild fire was needed.
The Online Safety Bill is due to return to Parliament in early December, following a number of delays. The digital department said it could not say when the amendments would be tabled.
The government recently announced other new offences being added to the bill that would crack down on the sharing of intimate images without consent. Representatives from both Pinterest and Meta, Instagram's parent company, gave evidence during Molly Russell's inquest.
Meta executive Elizabeth Lagone said she believed that posts seen by Molly, which her family say encourage suicide, were safe, but the firm agreed that regulation was needed.
Judson Hoffman of Pinterest told the inquest the site was not safe when the schoolgirl was using it. The company said it was committed to making ongoing improvements to help ensure the platform is safe for everyone.
Deputy Prime Minister and Justice Secretary Dominic Raab said: "Lives and families have been destroyed by those who encourage vulnerable internet users to self-harm. Our changes will ensure the full force of the law applies to those callous and reckless individuals who try to manipulate the vulnerable online in this way."