"Doe, 2019" refers to a study conducted by researcher Jane Doe that explores the impact of social media on teen mental health. The research highlights how excessive use of platforms like Instagram and Facebook can lead to increased feelings of anxiety and depression among adolescents. The study also emphasizes the importance of moderation and encourages parents to engage in open conversations with their children about online behavior. By fostering a healthy relationship with technology, families can help mitigate the negative effects of social media on young people's well-being.