This research paper delves into the parallels between Facebook and Big Tobacco, spotlighting the potential harm posed to teenagers' mental health by platforms like Instagram. Despite Section 230 protection, whistleblower Frances Haugen's revelations about Facebook's awareness of Instagram's negative effects on young people's mental health underscore the need for external regulation. The paper argues for comprehensive studies on social media's impact on teen mental health to inform policymakers and advocates for increased regulations. Using leaked Facebook documents, the research emphasizes algorithmic contributions to political polarization and underscores the urgency of addressing a potential mental health epidemic among youth. The methodology involves a case study approach, incorporating interviews, quantitative and qualitative data, and a specific focus on Instagram's impact on teen girls.