Judicial decisions on the responsibility of online platforms like Amazon.com for third parties’ sales of defective goods reflect the varied, state-centric nature of product-liability law. Outcomes have hinged on differing conceptions of who is a “seller,” how products enter the “stream of commerce,” and what constitutes “control,” among other traditional liability factors. Our trio of practitioners, which includes skilled plaintiff- and defense-side counsel, will assess the latest court rulings, identify emerging trends, and debate whether a consistent body of law is developing.