IN RE: SOCIAL MEDIA ADOLESCENT ADDICTION/PERSONAL INJURY PRODUCTS LIABILITY LITIGATION
Issue
In *In re: Social Media Adolescent Addiction/Personal Injury Products Liability Litigation*, Meta Platforms argues that five witnesses it intends to call at trial were properly disclosed to the State Attorneys General during fact discovery, making exclusion unwarranted. The dispute turns on whether Meta's disclosures were sufficiently specific to satisfy the MDL's discovery obligations and, separately, whether the AGs filed an unauthorized supplemental brief that the court should disregard.
What Happened
At the pretrial stage of this MDL, the State AGs moved to strike five witnesses from Meta's trial witness list, contending that Meta failed to adequately disclose them during discovery (ECF 3056). Meta filed this Notice on June 4, 2026, as a follow-up to its opposition (ECF 3060-1), attaching a declaration from its counsel Ashley M. Simonsen and twenty exhibits — including what appear to be deposition notices, correspondence, and discovery materials — intended to document that the five witnesses were in fact disclosed with adequate notice. Meta simultaneously asks the court to strike the AGs' own supplemental filing (ECF 3104), characterizing it as submitted without leave of court and therefore procedurally improper. The Notice itself does not develop extended legal argument; the twenty exhibits constitute the operative substance of Meta's position.
Why It Matters
This is a procedural housekeeping dispute internal to the MDL, but its practical stakes are real: losing witnesses on the eve of trial can meaningfully reshape a party's trial strategy and narrative. The outcome will turn on the specific language of this MDL's case management orders and whether Meta's documentary record is sufficient to show the AGs had genuine notice and opportunity to conduct discovery on the contested witnesses. The filing creates no new law and carries no significance beyond this litigation, but it illustrates the high-volume procedural friction that characterizes large MDL proceedings as they approach trial.
Related Filings
Other proceedings in the same litigation tracked by this monitor.
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