An Act relative to social media, algorithm accountability, and transparency

HD 5363 requires major social media platforms operating in Massachusetts to conduct monthly algorithm audits focused on child safety risks, such as mental health harms, addictive behaviors, and exposure to harmful content like tobacco or gambling. Covered platforms - defined as those processing personal data for 100,000+ Massachusetts residents or meeting specific revenue thresholds - must register annually with the Attorney General’s office, pay for independent audits, and submit transparency reports starting in 2026. The law mandates audits to assess whether platforms are "likely to be accessed" by children (e.g., through audience composition or marketing) and to evaluate algorithmic risks like bullying or predatory marketing. It establishes an Office of Social Media Transparency and Accountability within the Attorney General’s office to enforce these requirements and oversee an expert Advisory Council.