The Responsibility of Online Intermediaries for Illegal User Content in the EU and the US by Folkert Wilman offers a comprehensive analysis of the legal frameworks governing the liability of online intermediaries in both the European Union and the United States. Wilman, a member of the Legal Service of the European Commission, examines key legislative instruments such as the EU's e-Commerce Directive and the U.S.'s Communications Decency Act (CDA) and Digital Millennium Copyright Act (DMCA). The book delves into the balance between combating illegal online content and safeguarding fundamental rights, including freedom of expression. It also addresses recent regulatory developments, such as the EU's Digital Services Act and the U.S.'s ongoing debates over Section 230 of the CDA. Wilman advocates for a "double-sided duty of care," urging online intermediaries to proactively address illegal content while ensuring the protection of users' rights. This work serves as a valuable resource for legal professionals, policymakers, and scholars interested in the evolving responsibilities of online platforms in the digital age.