The First World War was a stimulant for the development of

The First World War acted as a stimulant for the development of radio as a communication technology.

Wartime needs pushed wireless telegraphy and radio forward for rapid military signalling, accelerating the medium.

Films existed before the war and grew mainly as entertainment, not as a war-driven signalling need.

The press was already an established mass medium long before the First World War.

The internet emerged decades later in the late twentieth century, unrelated to that war.

Public radio broadcasting spread widely from the 1920s onward.