Mark Zuckerberg, the CEO of Meta and founder of Facebook, is set to face a pivotal moment in a lawsuit that alleges social media platforms are detrimental to children's well-being. The trial, which centers on Instagram's impact on young users' mental health, marks the first time Zuckerberg will be questioned in a U.S. court. This landmark case could potentially erode Big Tech's long-standing legal defense against claims of user harm, as Meta may face damages if found guilty. The lawsuit is part of a global backlash against social media platforms for their role in children's mental health crises. Australia has already prohibited access to social media platforms for users under 16, and other countries, including Spain, are considering similar restrictions. In the U.S., Florida has banned companies from allowing users under 14 to access these platforms, with tech industry trade groups challenging the law in court. The case involves a California woman who began using Instagram and YouTube as a child, claiming that the companies profited from hooking kids on their services despite knowing the potential harm to their mental health. She alleges that the apps fueled her depression and suicidal thoughts, seeking to hold the companies liable. Meta and Google have denied the allegations, pointing to their efforts to add safety features and citing research that does not show social media changes kids' mental health. However, internal Meta documents have been unearthed through investigative reporting, revealing the company's awareness of potential harms. For instance, a recent study found that teens who reported Instagram made them feel bad about their bodies saw more 'eating disorder adjacent content'. As the trial unfolds, Zuckerberg's testimony will be crucial in addressing Meta's internal studies and discussions on Instagram's effects on younger users. The outcome of this case will have significant implications for the future of social media regulation and the legal responsibilities of tech companies in protecting user well-being, particularly among children.