Taking the constitutional significance of social media seriously.

This article analyzes two edited volumes that explore government regulation of social media platforms from distinct European and American legal perspectives. *Constitutionalising Social Media* presents a European approach advocating for the constitutionalization of social media through state-platform co-regulation to protect fundamental rights within a hybrid public sphere. In contrast, *Social Media, Freedom of Speech and the Future of Our Democracy* examines U.S. free speech controversies, focusing on the constraints imposed by First Amendment jurisprudence and section 230 of the Communications Decency Act, which limit regulatory interventions on private platforms. While both works address social media’s impact on information dissemination and fundamental rights, they reflect divergent legal traditions and regulatory possibilities, offering complementary insights into the challenges of governing digital speech in different constitutional contexts.