A California jury found Meta and Alphabet (YouTube) liable on all counts in a social media addiction trial, a landmark verdict described as the industry's "big tobacco moment." This legal precedent establishes product design, not just content, as a basis for liability. The same lawyers and families involved have thousands of similar cases lined up, and the verdict pressures companies to change their business models and increases legislative risk. The sector faces a heightened and sustained period of legal, regulatory, and reputational risk that could impact profitability and force fundamental operational changes. Legislative gridlock in the U.S. could delay sweeping new regulations; companies may settle cases without admitting fault or make superficial design changes.