Blurred Boundaries: Legal, Ethical, and Practical Limits in Detecting and Moderating Terrorist, Illegal and Implicit Extremist Content Online while Respecting Freedom of Expression

This study examines a pressing and highly topical challenge: how to assess online content that may undermine democracy, threaten national security and public safety, or infringe upon the rights of others—while safeguarding freedom of expression. The central question it explores, the specific challenges identified, and the recommendations it puts forward should not be viewed in a vacuum. Rather, they are situated within a broader and increasingly complex societal and political context. A range of systemic developments shapes the environment in which this work takes place: the rise of online radicalisation, particularly among children and young adults; the expanding influence of large technology platforms and the tensions this creates with rule-of-law-based democratic societies leading to a global trend toward both techno-libertarianism andtechno-authoritarianism; and the evolving role of governments as they seek to reconcile the
imperatives of security, safety, and national interest with those of privacy, human rights, and minority protection. These challenges are compounded by the unprecedented speed and scale of online information dissemination, growing concerns about disinformation and foreign influence, and the urgent need to strengthen societal resilience and media literacy. While this study does not address each of these systemic issues in depth, they form the essential backdrop against which its findings and proposals should be understood.