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The best known and most striking cases are those of Blue Whale and Blackout, about which a lot was written between 2017 and 2019: they were what the British call online hoaxes, that is lies, hoaxes, false myths that, thanks to the Internet, spread in a way that is difficult to control. I am things that may not exist in the real world, but that have consequences in the real world concrete and dangerous: adolescents driven to suicide or challenged to deprive themselves of oxygen to the point of death.
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