Instagram CEO Adam Mosseri leaves the Los Angeles County Superior Court after testifying in a social media trial in Los Angeles on February 9, 2026. Arguments began February 9 in a landmark US trial that could establish a legal precedent on whether social media companies deliberately designed their platforms to lead to addiction in children. The case in Los Angeles Superior Court is being seen as a bellwether proceeding because its outcome could set the tone for a tidal wave of similar litigation across the United States. (Photo by Apu GOMES / AFP via Getty Images)