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Why It Matters: This pre-trial skirmish over witness lists telegraphs the shape of the trial itself: the five contested witnesses are positioned to contest or contextualize the core claim that Meta designed its platforms with knowledge that they were harmful to children, which maps directly onto the negligent design and platform-own-conduct theories that remain unsettled across the broader § 230 landscape. Meta's strategy of deploying the AGs' own detailed interrogatory allegations to win a procedural point carries a notable risk — those same allegations describe Meta's purported knowing harm to minors in terms that may be difficult to cabin once introduced into the trial record for any purpose. For observers tracking how product-design defect claims against social media platforms will be tested against actual trial evidence rather than pleadings, this filing is a useful preview of the evidentiary terrain on which those doctrines will be litigated in what is among the highest-stakes platform liability proceedings currently in active pre-trial proceedings.

Why It Matters: This filing is a procedural skirmish, not a substantive legal development, but it carries practical significance for how the trial will unfold: whether five Meta witnesses survive or are stricken will directly shape the evidentiary landscape at trial. The mutual accusations of improper supplemental filing — each side effectively doing what it accuses the other of doing — illustrate how pre-trial witness disputes in complex MDLs can become procedural warfare that runs independent of the underlying merits. The Court's response will serve as a reliable signal of how tightly it intends to enforce case management discipline in the final stretch before trial, and practitioners monitoring this MDL should treat the ruling as an early indicator of the judge's trial-phase posture rather than as doctrinal output.

Why It Matters: This filing does not advance any substantive legal doctrine — it is pretrial housekeeping in one of the most consequential social media liability cases currently pending in federal court. Its practical stakes are nonetheless real: if Meta's five challenged witnesses survive the motion to strike, they will be available at trial to contest causation, damages, or platform-design claims before the jury in the State AG bellwether proceeding. How Judge Gonzalez Rogers resolves the dispute over the AGs' supplemental filing may also offer a signal about how strictly motion practice discipline will be enforced as this MDL moves into its trial phase. For those tracking the litigation, the document is less a source of new legal rules than an indicator of where the parties are expending effort in the final stretch before trial.

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.

Why It Matters: This filing presses a structural question about the outer limits of judicial power that has rarely been litigated directly: once a court document becomes publicly accessible—even briefly—can a federal court order ordinary people and legal-records archives to delete it? The answer has immediate stakes for the social media MDL, where internal corporate documents that appeared on PACER may be effectively irrecoverable from public archives, but the implications extend to every MDL and high-profile federal case where inadvertent public filing occurs. The convergence of prior restraint doctrine and Section 230 in a court-records context is novel, and if accepted even in part, could meaningfully constrain district courts' equitable reach over third-party hosts like CourtListener and analogous legal transparency infrastructure. Three open questions flagged here—whether inherent docket-management power extends to ordering destruction of records held by non-parties, whether Section 230 bars affirmative injunctive relief compelling content removal, and how Rule 65's "active concert" prong applies to systematic PACER-mirroring services—are likely to recur as litigation-document archives become more organized and publicly accessible.

Why It Matters: The Section 230 argument is the most doctrinally ambitious piece of this filing: if accepted, it would establish that Section 230 immunity can collapse the Daubert admissibility inquiry—barring an expert from quantifying harm attributable to third-party content even when the underlying claims have survived dismissal. That would mark a significant procedural extension of immunity doctrine well beyond its traditional deployment at the pleading stage, and courts in this MDL have already drawn lines that complicate Meta's position. The BEEF-survey extrapolation challenge is the brief's strongest technical argument, representing a clean application of *Joiner*'s analytical-leap standard to a fact pattern—counsel-selected, geographically limited, temporally narrow survey data projected across years—that is difficult to rehabilitate through rebuttal alone. More broadly, this filing is worth watching because the expert exclusion fight will shape what the jury-facing damages case looks like in one of the first state AG consumer protection trials to proceed in this MDL, and a successful Daubert challenge here could effectively cap the states' ability to quantify violations at scale.

Why It Matters: This report represents a significant moment in the effort to establish that products liability design defect doctrine applies to social media platform architecture — a theory that, if credited at summary judgment, would move the litigation past the threshold question of legal viability and into full merits adjudication. The feasibility argument is particularly consequential: by grounding safer alternative design in real-world commercial comparators that predated the alleged harm period, Plaintiffs aim to foreclose any claim of technological impossibility as a matter of law, converting feasibility into a jury question. Two open doctrinal questions hang over the report's reception: whether courts will apply a minor-specific risk-utility standard for engagement features that serve adult users while foreseeably harming children, and whether COPPA compliance functions as a regulatory floor or a safe harbor that displaces common law claims — neither of which has been definitively resolved in this MDL. The report's individual causation gap and its use of Estes's own platform as a feasibility comparator are predictable pressure points that Defendants will likely press in both Daubert proceedings and in reply briefing.

Why It Matters: Meta's core defense in this MDL is that Section 230 shields it from state liability for harms caused by its platforms — a defense that, if accepted at summary judgment, could end the case before trial. The State AGs are pointing to a brand-new ruling from Massachusetts's highest court as evidence that courts are increasingly unwilling to let Section 230 block consumer protection claims about how Meta designed and marketed its products, and the eve-of-argument timing is plainly strategic. Whether the filing moves the needle depends entirely on whether the MDL court finds the Massachusetts reasoning persuasive under Ninth Circuit law — a question this notice conspicuously declines to answer. More broadly, the filing adds one more data point to an emerging question in the courts: whether state attorneys general suing in their sovereign enforcement capacity occupy a distinct doctrinal position under Section 230 that is not yet resolved by existing federal precedent.

Why It Matters: This opinion, from the highest court of Massachusetts, establishes the most analytically rigorous framework to date for limiting Section 230 immunity in platform-design cases, grounding a formal two-element test in a careful reconstruction of common-law publisher liability that competing courts will find difficult to dismiss as result-oriented. It directly and by name repudiates the MDL district court's Section 230 rulings, creating an explicit record of contrary authority as the Ninth Circuit considers an appeal of those very rulings argued in January 2026. For the AG plaintiffs in this MDL, the opinion supplies both doctrinal ammunition — a ready-made analytical framework — and a high-court imprimatur for the proposition that content-indifferent design claims fall entirely outside Section 230's scope. The Court left open whether the design-defect framing alone would independently defeat immunity and flagged without deciding that Meta's push-notification system may render Meta an information content provider, preserving additional avenues for future plaintiffs.

Why It Matters: The platforms are asking the court to tell jurors, as a settled legal matter, that nearly everything plaintiffs challenge — recommendation algorithms, autoplay, infinite scroll, engagement notifications — is legally protected activity that cannot give rise to liability, effectively resolving the most contested open question in Section 230 law inside a jury trial rather than through a dispositive motion. The Supreme Court's 2023 *Gonzalez v. Google* decision deliberately left unresolved whether algorithmic amplification constitutes "publishing," meaning whatever the court decides about this instruction could become the most significant judicial statement on that question to emerge from this MDL. The court's prior rejection of an earlier version signals meaningful skepticism, and if the court issues a written ruling explaining why it again rejects or substantially rewrites the instruction, that order — not the instruction itself — may carry the greatest precedential weight for how future social media injury plaintiffs are permitted to frame their claims.

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.

Why It Matters: As a pretrial exhibit list rather than a ruling or substantive motion, this document does not advance legal doctrine; however, the categories of exhibits—particularly school financial records, pre-existing behavioral data, and district technology and digital-citizenship plans—signal that Defendants intend to contest causation and damages by attributing student mental-health and behavioral issues to pre-existing institutional, socioeconomic, and pandemic-related factors rather than to platform design.

Why It Matters: This witness list signals that defendants' trial strategy will center on contesting general and specific causation through scientific experts while affirmatively presenting evidence of platform safety efforts, positioning the case as a significant test of whether product liability theories can survive against social media platforms when defendants offer robust alternative-cause and reasonable-design defenses in the school-district plaintiff context.

Why It Matters: This witness list signals that the school district bellwether trial in the Social Media MDL is advancing toward trial on a products liability theory that characterizes engagement-optimizing algorithms and addictive design features as actionable defects — a framing that, if successful, could establish a roadmap for institutional plaintiffs to recover costs attributable to platform design independent of Section 230 immunity arguments previously litigated in the MDL.

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.

Why It Matters: The breadth and specificity of the exhibit list signals that plaintiffs intend to prove at trial that Meta possessed extensive internal knowledge of harms its platforms caused to adolescent users, which could be significant for establishing the knowledge and design-defect elements of product liability claims that courts in this MDL have allowed to proceed notwithstanding Section 230 immunity arguments.

Why It Matters: This document is significant because it reveals how §230 and First Amendment protections will be operationalized at the jury instruction level in the first bellwether trial of a major social media addiction MDL, effectively showing which platform design features a court has already ruled immune from tort liability; the outcome could establish a concrete, feature-by-feature framework for distinguishing actionable product design claims from immunized publishing decisions that other courts and litigants could adopt or contest in future platform liability litigation.

Why It Matters: The motion presents a significant question about whether Section 230 immunity can be invoked not only to defeat substantive liability claims but also to exclude expert damages methodologies that treat a platform's publication of third-party content as the predicate "violation" for penalty calculation purposes, potentially extending §230's reach into the evidentiary phase of litigation. If the court grants exclusion on this ground, it would signal that plaintiffs in platform-liability cases must carefully disaggregate algorithmic and design conduct from publishing conduct even at the damages-quantification stage.

Why It Matters: This reply brief illustrates how the §230 immunity question is migrating from the pleadings and summary judgment stages into trial-management rulings, testing whether the court's prior "feature-by-feature" liability framework can be operationalized as an evidentiary filter; the outcome could establish a replicable in limine standard for separating protected editorial/publishing conduct from actionable product-design claims in platform-liability litigation.