This book offers a unique exploration of the current state of freedom of speech as a basic right available to everyone. The research focuses on the different development stages of the concept of freedom of speech and the use of modern indicators to depict the its treatment in different legal cultures, including the obligations under international treaties and the effects that the globalising and digitalising environment have had on it. The authors conduct a broad survey of freedom of speech around the world, from Europe over Russia and both Americas to Africa, Asia, and Australia. The aim of this survey is to identify safeguards of freedom of speech on both a national and an international level, violations and threat scenarios, and in particular challenges to freedom of speech in the digital era.