As Meta Platforms and Google start presenting their defense in a landmark trial over social media addiction, the companies are pushing back on claims by the 20-year-old who brought the case that they¡¯re solely to blame for her mental health struggles.

Lawyers for Meta, the parent company of Instagram and Facebook, have indicated they plan to call the woman¡¯s therapists as witnesses to demonstrate that her psychological trauma came from turmoil in her family and school life rather than the platforms.

Google¡¯s team, meanwhile, is highlighting her historical usage of YouTube to show that in recent years, she spent an average of just a half hour a day on the video-sharing site ¡ª not enough time to qualify as addiction.