IN RE: SOCIAL MEDIA ADOLESCENT ADDICTION/PERSONAL INJURY PRODUCTS LIABILITY LITIGATION
Issue
This pretrial order addresses whether defendants in a social media products liability MDL may introduce expert testimony characterizing adolescent harm claims as unsupported or overstated, and whether plaintiffs may rely on lay witness accounts of exposure to inappropriate content as circumstantial evidence of harm without closing the causation loop through expert testimony alone. The questions are non-obvious because they sit at the intersection of FRE 702 gatekeeping, the design-defect theory that has so far allowed these claims to survive § 230, and the practical reality that exclusion of defense experts at the bellwether stage locks in the plaintiff's causal narrative for the jury. The stakes are amplified by the MDL's bellwether structure, in which evidentiary rulings here will likely shape how parallel cases are tried or settled across hundreds of consolidated actions.
What Happened
Judge Yvonne Gonzalez Rogers issued Pretrial Order No. 2 on March 30, 2026, resolving ten motions in limine filed by both sides in advance of the bellwether trial in Breathitt County School District v. Meta Platforms Inc. et al. The court excluded both of defendants' affirmative experts: Dr. Hutt was barred for offering impermissible legal-conclusion advocacy rather than methodologically grounded opinion, and Dr. Hampton was excluded for circular, ipse dixit reasoning underlying his "no evidence of harm" and "moral panic" framing. Plaintiff's core defect theories — CSAM-reporting failures and content-filter labeling defects — survived defendants' challenge and will be presented to the jury, while plaintiff's lay testimony regarding exposure to inappropriate images was held sufficient to support a permissible inferential harm argument. The court denied both sides' overbroad motions on content moderation evidence and indicated a limiting instruction would follow, denied most sealing requests, and deferred one ruling on financial mismanagement evidence pending submission of audit materials.
Why It Matters
The categorical exclusion of both defense experts creates a materially asymmetric evidentiary posture at trial: defendants enter without credentialed methodological opposition to the foundational claim that social media causes adolescent harm, while plaintiffs' specific design-defect theories proceed intact. The court's acceptance of circumstantial lay testimony as sufficient to support an inferential harm argument is a notable departure from the more demanding causation standards applied in other complex products liability contexts — such as pharmaceutical MDLs — and may prove contentious on appeal or in parallel proceedings where defense experts have survived Daubert scrutiny. The circumscribed admission of foreign regulatory evidence bearing on defendants' knowledge and feasible alternative design opens a significant avenue for plaintiffs across the MDL to introduce EU and UK regulatory findings without triggering foreign-law instructions, and the deferred financial mismanagement ruling leaves open a question that could bear directly on punitive damages framing in downstream bellwether cases.
Related Filings
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