This study maps and analyses current and future threats from online misinformation, alongside currently adopted socio-technical and legal approaches. The challenges of evaluating their effectiveness and practical adoption are also discussed. Drawing on and complementing existing literature, the study summarises and analyses the findings of relevant journalist and scientific studies and policy reports in relation to detecting, containing and countering online disinformation and propaganda campaigns. It traces recent development and trends and identifies significant new or emerging challenges. It also addresses potential policy implications of current socio-technical solutions for the EU.