Arturo Béjar, identified as a former Meta engineer by NPR and CBS News, testified on August 19, 2026, in a trial at the Ronald V. Dellums Federal Building in Oakland, California. The lawsuit, led by attorneys general from California, Colorado, Kentucky, and New Jersey, alleges that Meta designed Facebook and Instagram to cause addiction in children and violated consumer and child data protection laws while misleading the public about risks. Meta has denied the allegations.