Julianna Arnold (C), parent and plaintiff in the case, speaks outside the Los Angeles Superior Court during the social media trial tasked to determine whether social media giants deliberately designed their platforms to be addictive to children, in Los Angeles, on February 18, 2026. Meta CEO Mark Zuckerberg on Wednesday said he regretted the slow progress his company made in identifying underage users on Instagram as he testified at a landmark social media addiction trial in Los Angeles. Zuckerberg was the most hotly anticipated witness in the California trial, the first in a series of cases that could set legal precedent for thousands of lawsuits filed by American families against social media platforms. (Photo by Patrick T. Fallon / AFP via Getty Images)

Julianna Arnold (C), parent and plaintiff in the case, speaks outside the Los Angeles Superior Court during the social media trial tasked to determine whether social media giants deliberately designed their platforms to be addictive to children, in Los Angeles, on February 18, 2026. Meta CEO Mark Zuckerberg on Wednesday said he regretted the slow progress his company made in identifying underage users on Instagram as he testified at a landmark social media addiction trial in Los Angeles. Zuckerberg was the most hotly anticipated witness in the California trial, the first in a series of cases that could set legal precedent for thousands of lawsuits filed by American families against social media platforms. (Photo by Patrick T. Fallon / AFP via Getty Images)

Julianna Arnold (at microphones), parent and plaintiff in the case, speaks outside the Los Angeles Superior Court during the social media trial tasked to determine whether social media giants deliberately designed their platforms to be addictive to children, in Los Angeles, on February 18, 2026. Meta CEO Mark Zuckerberg on Wednesday said he regretted the slow progress his company made in identifying underage users on Instagram as he testified at a landmark social media addiction trial in Los Angeles. Zuckerberg was the most hotly anticipated witness in the California trial, the first in a series of cases that could set legal precedent for thousands of lawsuits filed by American families against social media platforms. (Photo by Patrick T. Fallon / AFP via Getty Images)

A US Geological Survey (USGS) employee, part of the federal science agency that monitors the nation's natural resources and hazards, collects water samples from Chain Bridge in McLean, Virginia, on February 18, 2026, after a sewage leak released 243 million gallons of wastewater into the Potomac River. A nonprofit says authorities in the US capital Washington have failed to properly warn the public about a massive sewage leak into the Potomac River, thought to be among the largest such spills in the nation's history. (Photo by ANDREW CABALLERO-REYNOLDS / AFP via Getty Images)

US Geological Survey (USGS) employees, part of the federal science agency that monitors the nation's natural resources and hazards, collect water samples from Chain Bridge in McLean, Virginia, on February 18, 2026, after a sewage leak released 243 million gallons of wastewater into the Potomac River. A nonprofit says authorities in the US capital Washington have failed to properly warn the public about a massive sewage leak into the Potomac River, thought to be among the largest such spills in the nation's history. (Photo by ANDREW CABALLERO-REYNOLDS / AFP via Getty Images)

A US Geological Survey (USGS) employee, part of the federal science agency that monitors the nation's natural resources and hazards, collects water samples from Chain Bridge in McLean, Virginia, on February 18, 2026, after a sewage leak released 243 million gallons of wastewater into the Potomac River. A nonprofit says authorities in the US capital Washington have failed to properly warn the public about a massive sewage leak into the Potomac River, thought to be among the largest such spills in the nation's history. (Photo by ANDREW CABALLERO-REYNOLDS / AFP via Getty Images)

US Geological Survey (USGS) employees, part of the federal science agency that monitors the nation's natural resources and hazards, collect water samples from Chain Bridge in McLean, Virginia, on February 18, 2026, after a sewage leak released 243 million gallons of wastewater into the Potomac River. A nonprofit says authorities in the US capital Washington have failed to properly warn the public about a massive sewage leak into the Potomac River, thought to be among the largest such spills in the nation's history. (Photo by ANDREW CABALLERO-REYNOLDS / AFP via Getty Images)

Meta CEO and Chairman Mark Zuckerberg arrives at Los Angeles Superior Court ahead of the social media trial tasked to determine whether social media giants deliberately designed their platforms to be addictive to children, in Los Angeles, on February 18, 2026. Zuckerberg is scheduled to testify Wednesday. (Photo by Patrick T. Fallon / AFP via Getty Images)