A US appeals court ruled on Monday that Meta Platforms cannot block thousands of youth-addiction lawsuits under Section 230 immunity, clearing the way for discovery into how the company designed its products and what it knew about teen harm. The 9th Circuit rejected Meta's argument that the law provided immunity from being sued rather than just a defense against liability, allowing federal litigation to proceed while Meta's appeal remains unresolved. The decision leaves Meta facing trials examining allegations that its platforms were deliberately engineered to keep young users addicted, contributing to mental health issues like depression and anxiety. This ruling follows a recent New Mexico state court order requiring Meta to pay $567 million into a teen mental health fund and implement safety measures after finding the company created a public nuisance. Additionally, a Los Angeles jury previously found Meta liable for negligence in a landmark case involving a young user, awarding $3 million in damages with Meta responsible for 70%. The current federal litigation involves states, municipalities, school districts, parents, and individual users, with attorneys stating the upcoming trials will reveal what Meta knew about its products' impact on children. The court also rejected Meta's request to postpone a trial scheduled to begin Wednesday in a case brought by 29 state attorneys general. Plaintiffs allege that Meta illegally collected children's data and misled consumers about service safety, while Meta continues to dispute the legal theories underpinning these cases.