IL SB3454

Requires social media platforms using algorithmic recommender systems to publicly disclose a list of all algorithms in use, descriptions of each input and data source, and the weights used in ranking content

Mandates that algorithmic recommender systems be configured by default to maximize "long-term user value metrics" (user satisfaction and preferences) rather than engagement metrics designed to maximize time spent on platforms

Establishes heightened protections for minors, requiring platforms to configure algorithms for users they know or should know are minors to default to long-term user value metrics applicable to minors

Requires covered platforms to conduct annual "long-term holdout assessments" lasting at least 12 months, comparing user outcomes between those exposed to algorithm changes and control groups, with results publicly disclosed

Violations constitute unlawful practices under the Consumer Fraud and Deceptive Business Practices Act, with the Attorney General empowered to adopt implementing rules by January 1, 2028, and the Act taking effect January 1, 2027