BBC asked some parenting experts for their tips on how to pry those phones away from their offspring's hands – even if only for a short while.

I've been speaking about the importance of number 4 for years.

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An independent game developer for Roblox says he believes the platform's child safety measures, including age verification checks, do not go far enough.

- parents should monitor their children on the platform "24/7, and if that's not possible then they shouldn't be playing Roblox".

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The YouTube ad for PixVideo - AI Video Maker, seen in January, showed a "before" and "after" image of a young women, with red scribble overlaid on her midriff in the former, and parts of her bare skin exposed in the latter.

Text across the bottom of the picture stated: "Erase anything" followed by a heart-eyes emoji.

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They tell young men how worthless they are.. then offer themselves up as the solution.

"They sell courses on how to increase your sexual market value (SMV) - basically a measurement of how attractive you are according to their scale."

The higher your SMV, he explains, the more likely you are to have sex with a woman. Looksmaxxing, to a certain degree, becomes a way to climb the attractiveness ladder. If a woman doesn't want you after all that then either you haven't done enough self-improvement or it's their fault, as the logic goes.

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When some parents discovered the 'red v blue' posts, the posters were forwarded to parental WhatsApp and Facebook groups and schools were made aware.

And so some secondary school-age children only became aware of the posters in the first place because of what their parents were seeing.

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Ali told police he had first come into contact with a man called Abu Qatada, whom he believed to be an IS member fighting the Taliban in Afghanistan, while playing online games such as Roblox.

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