The book considers how speech on social media during an armed conflict could potentially be considered a criminal offence. In doing so, it reviews the European Court of Human Rights case law on the limits of freedom of speech in an armed conflict. The author then makes recommendations on how this should be reconciled with freedom of speech in a post-conflict society.  The book first outlines the propaganda cyberwar strategies being employed by the Russian Federation in the war against Ukraine. It then considers such incidents against the criminal law of Ukraine and Germany to determine when speech on social media can be considered an offence.