Arguments are set to begin today in a landmark U.S. trial that could establish a legal precedent on whether social media companies deliberately designed their platforms to lead to addiction in children. Instagram’s parent company Meta and Google’s YouTube will face claims; TikTok and Snap, which were originally named in the lawsuit, settled for undisclosed sums. Executives, including Meta CEO Mark Zuckerberg, are expected to testify at the trial, which will last six to eight weeks. Google spokesperson José Castañeda said the claims against YouTube are “simply not true.” He said: “Providing young people with a safer, healthier experience has always been core to our work.”