IN RE: SOCIAL MEDIA ADOLESCENT ADDICTION/PERSONAL INJURY PRODUCTS LIABILITY LITIGATION
Issue
Whether expert general causation opinions offered to show that specific platform design features cause compulsive use and mental health harms in adolescents must be excluded under Federal Rule of Evidence 702 because the experts fail to disentangle actionable design defects from content and conduct immunized by Section 230 and the First Amendment.
What Happened
In this MDL products liability action brought by school districts and state attorneys general against Meta, Google, ByteDance, and Snapchat, defendants moved under Rule 702 to exclude thirteen plaintiffs' general causation experts on multiple grounds, including methodological unreliability, lack of qualifications, improper reliance on internal company documents, and—critically—failure to isolate the causal effects of design features the court had previously deemed actionable from features and content barred by Section 230 or the First Amendment. The court denied the Section 230/First Amendment exclusion argument across all twelve experts to whom it applied, holding that expert testimony need not independently establish every element of the plaintiff's case to be admissible, and that the experts' reports did in fact address the specific actionable design defects identified at the motion-to-dismiss stage. The court granted the motions in part, however, striking discrete opinions in which experts—lacking relevant expertise—opined that defendants consciously prioritized profit and engagement over user wellbeing, finding those opinions went beyond each witness's disclosed area of expertise.
Why It Matters
This ruling advances the theory that product-design claims targeting social media platforms' compulsive-use-inducing features can survive both Section 230 immunity and First Amendment limits at the expert-admissibility stage, so long as expert opinions are tethered to the specific design defects the court has deemed actionable rather than to third-party content or protected publishing decisions—a framework that could shape how plaintiffs structure expert testimony in future platform-liability litigation.
Related Filings
Other proceedings in the same litigation tracked by this monitor.
How accurate was this summary?