For years, social media giants have argued against claims that their platforms harm young people’s mental health. Starting Tuesday, they will for the first time have to defend against those claims before a jury in a court of law.

A landmark social media addiction trial in which top tech executives are expected to testify begins on Tuesday in California.

KGM claims that her use of social media from an early age addicted her to the technology and exacerbated depression and suicidal thoughts.