Instagram CEO Adam Mosseri appeared in a California courtroom this week to testify in a high-profile lawsuit brought by 29 U.S. states against Meta, the parent company of Instagram and Facebook. The legal proceedings center on accusations that Meta knowingly misled the public and regulators regarding the effectiveness and usage of its teen safety tools.

During his testimony, Mosseri addressed claims that the company suppressed negative internal data about how teens interact with safety features. Prosecutors challenged the executive on whether Meta actively hid information that would suggest their safety measures were underutilized or ineffective. In response, Mosseri denied these allegations, stating, “I am not trying to encourage my team to hide anything.”

This appearance marks the first time a top-level Meta executive has taken the stand in this specific litigation. While the testimony began late Tuesday, the proceedings are expected to continue through Wednesday. The case represents a significant moment in the ongoing debate over the responsibility of social media giants to protect younger demographics from potential online harms. While the prosecution focused on the alleged concealment of internal metrics, the defense maintains that the company is committed to transparency and user safety. The court is currently examining internal communications and data reports to determine if the company’s public claims aligned with its internal findings.