The headteacher of Molly Russell's secondary school has told an inquest into the teenager's death it is "almost impossible" to keep track of the risks posed to pupils by social media.
North London coroner's court heard of the "complete and terrible shock" at Molly's school after the 14-year-old killed herself in November 2017. Molly, from Harrow in north-west London, killed herself after viewing extensive amounts of online content related to suicide, depression, self-harm and anxiety.
Sue Maguire, the headteacher at Hatch End high school in Harrow, was asked how difficult it was for a school to stay on top of dangerous social media content.
She said: "There is a level where I want to say it is almost impossible to keep track of social media but we have to try, and we have to respond to the information as we receive it."
Describing the school's "shock" at Molly's death, Maguire added that teachers had warned students about the "dangers of social media for a long time".
She said: "Our experience of young people is that social media plays a hugely dominant role in their lives and it causes no end of issues. But we don't present a stance that they should not use it. But it presents challenges to schools that we simply didn't have 10 or 15 years ago."
Oliver Sanders KC, representing the Russell family, asked Maguire whether the school was aware of the suicide and self-harm-related content available to students on sites such as Instagram.
Maguire said: "At the time, we were shocked when we saw it. But to say that we were completely shocked would be wrong because we had been warning young people about the dangers of social media for a long time."
The deputy headteacher, Rebecca Cozens, who is also head of safeguarding at the school, told the inquest once young people had gone "down the rabbit hole" on social media, it was a "deep one".
On Monday a senior executive at Meta, the owner of Instagram, apologised after acknowledging that Molly had viewed content that breached the platform's content guidelines. Elizabeth Lagone, the head of health and wellbeing policy at Meta, said: "We are sorry that Molly saw content that violated our policies, and we don't want that on the platform."
Last week an executive at Pinterest, another platform Molly interacted with heavily before her death, said the site was not safe when the teenager used it.
The senior coroner, Andrew Walker, told the Russell family he would deliver his conclusions by the end of the week.
