The world’s biggest social media companies face several landmark trials this year that seek to hold them responsible for harms to children who use their platforms. Opening arguments for the first, in Los Angeles County Superior Court, begin this week. Instagram parent company Meta and Google’s YouTube will face claims that their platforms deliberately addict and harm children. TikTok and Snap, which were originally named in the lawsuit, settled for undisclosed sums. This case marks the first time the companies will argue their case before a jury, and the outcome could have profound effects on their businesses and how they will handle children using their platforms.