A 20-year-old woman is seeking to hold social media companies responsible for harms to children who use their platforms. She began using the platforms as a young child and claims her early use of social media addicted her to the technology and exacerbated depression and suicidal thoughts. Meta and YouTube are the two remaining defendants in the case, which TikTok and Snap settled. The woman, who has been identified by her first name, Kaley, and initials, KGM, has testified before a jury in the unprecedented case, saying she was on social media “all day long” as a child.