A landmark trial in the United States is putting the relationship between children and social media under renewed scrutiny. Twenty-nine US states are taking on Meta, alleging the technology giant designed features on Facebook and Instagram to keep young users engaged, despite risks to their well-being. Meta strongly rejects allegations its platforms were designed to addict or harm children and says it has spent years developing safeguards for younger users. But beyond the legal arguments are families who say their children paid the ultimate price.