MDL 3047 is a multidistrict litigation consolidating hundreds of lawsuits against social media companies including Meta, TikTok, Snap, and Google. The lawsuits allege these companies designed their platforms to be addictive to children and teenagers, causing mental health harm including depression, anxiety, and eating disorders.

Which companies are defendants in MDL 3047?

The primary defendants include Meta (Facebook, Instagram), TikTok (ByteDance), Snap Inc. (Snapchat), and Google (YouTube). These companies are accused of using manipulative design patterns like infinite scroll, autoplay, and algorithmic recommendations to maximize engagement regardless of harm to young users.

What are addictive design patterns in social media?

Addictive design patterns include features like infinite scroll (endless content feeds), variable reward schedules (unpredictable likes/notifications), social validation loops, autoplay videos, and algorithmic recommendations optimized for engagement over wellbeing. These patterns exploit psychological vulnerabilities, particularly in developing adolescent brains.

First Social Media Bellwether Trial Begins

Today marks a watershed moment in technology accountability litigation. The first bellwether trial in MDL 3047—Harford County Public Schools v. Meta Platforms, Inc., et al.—begins in the United States District Court for the Northern District of California.

What's At Stake

This trial will be the first time a jury hears evidence about whether social media design features—not content—constitute product defects that harm children. The outcome could reshape how technology companies approach product development.

Key Questions for the Jury

Design Defect: Are features like infinite scroll, algorithmic amplification, and variable reward mechanisms "defective" under product liability law?

Causation: Did these features cause or contribute to the mental health crisis among students in Harford County?

Knowledge: Did defendants know their products were harmful and fail to act?

Damages: What are the compensable costs the school district incurred?

What to Watch

**Internal documents:** Plaintiffs are expected to present internal Meta research showing the company knew Instagram harms teens
**Expert testimony:** Psychologists, neuroscientists, and economists will testify about mechanisms and damages
**Defense strategy:** Expect defendants to argue correlation is not causation and that Section 230 should apply

Timeline

The trial is expected to last 6-8 weeks. A verdict could come as early as March 2026.

We'll be providing daily updates throughout the trial.

First Social Media Bellwether Trial Begins: What to Watch

First Social Media Bellwether Trial Begins

What's At Stake

Key Questions for the Jury

What to Watch

Timeline