00:00Facebook founder Mark Zuckerberg has appeared in court in Los Angeles
00:04for a landmark trial examining the techniques social media platforms use to hook young users.
00:11US correspondent Reid Butler explains.
00:14Mark Zuckerberg, the Facebook founder, for the first time testifying in front of a jury.
00:21It's been dubbed the tech addiction trial.
00:25Alan Mehta's Instagram and Google's YouTube are both in the spotlight.
00:30Zuckerberg arrived at the LA court today with a steely resolve.
00:34He's faced congressional grillings before but not in court.
00:38The stakes here are high.
00:39Legal ruling could set a precedent for thousands of other cases against social media companies
00:45and also force these platforms to change policies and even their algorithms.
00:50Lawyers for the lead plaintiff are accusing Instagram and YouTube of working to addict young users
00:56despite knowing the mental health risks.
01:00Today, Zuckerberg was questioned over whether he knew how many under 13s were using the platform.
01:05He said it was difficult to enforce an age limit.
01:09He was also pressed on tweaking the algorithm on purpose to increase engagement.
01:14Watching all of this, parents who say their children have been negatively impacted by social media.
01:20Some have even died as a result of social media use, according to those parents.
01:26The plaintiff started using the platforms at a young age, nine years old,
01:31but Mehta is arguing it was her difficult family life that led to her struggles, not social media.
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