Meta allegedly stopped internal research on social media’s impact on people after finding negative results, a court filing released Friday claims.

The filing took place in a Northern California District Court, as a group of U.S. state attorneys general, school districts, and parents launched a suit against Meta, Google-owned YouTube, TikTok, and Snap.

The court documents allege that Meta misled the public on the mental health risks to children and young adults who excessively use Facebook and Instagram, even though its research showed that the social media apps had demonstrated harm.

“The company never publicly disclosed the results of its deactivation study,” the lawsuit says. “Instead, Meta lied to Congress about what it knew.”

The research, code-named “Project Mercury,” took place i

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