Britain was arguably the pioneer: in the 1920s. [fact]
As in other areas of propaganda, Britain was arguably the pioneer: in the 1920s, the BBC was by far the most advanced state-owned radio system in the world, and by 1924, it would first begin broadcasting speeches by King George V—long before the stammering George VI would have to rally the nation to challenge the Third Reich.
Tim Wu, The Attention Merchants, loc. 414