Pressuring those with a financial stake: shareholders She said some videos have remained on the site for years. But, McGrath said she sees such videos and reports them daily. YouTube spokesperson Brittany Stagnaro told NPR that the company's policy is to remove videos that involve challenges with asphyxiation or choking. 'The only ones we know of are the people that go to the news or find each other.' 'That's just the tip of the iceberg,' McGrath said. 'Formal statistics are limited because no public health databases monitor these activities,' states the nonprofit. Griffin is one of an estimated 1,385 people known to have died from the blackout challenge, according to a nonprofit called Erik's Cause, which was founded by Judy Rogg, whose son also died from a choking game. On Friday, she addressed YouTube's parent company Alphabet during an annual shareholder meeting calling for change and accountability. 'I didn't know anything was wrong until it was too late,' McGrath said, in an exclusive interview with NPR. He did the blackout challenge from his room, while FaceTiming with friends. That's what happened to Griffin one night in February 2018.

Like the blackout challenge, which is when someone holds their breath until they pass out. Some of these dares, however, can be dangerous. Social media challenges involve people recording themselves doing something dramatic, funny or risky.

'But I never knew there were any that were deadly.' 'We had heard of challenges,' said McGrath, who lives in Madison, Wis. That's where he and his friends saw something called the blackout challenge. Because he was so interested in science and experiments, he spent a lot of time watching YouTube videos. Griffin played baseball and the drums and had even won a national science competition. Annie McGrath never had to worry too much about her 13-year-old son Griffin.

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