Different from other revolutions which took place just once like Harari's
- cognitive revolution
- agricultural revolution
- unification of mankind
- scientific revolution
revolutions of communication took place several times (as I suppose):
- by spoken language (part of Harari's cognitive revolution)
- by paintings
- by writing systems
- by printing
- by telegraphy
- by broadcast technologies like radio and television
- by telephone
- by email and messaging
- by broadcast technologies like WWW and social networks
Other aspects, forms and technologies of communication didn't come as revolutions but gently evolved (and didn't play such prominent roles):
I'm looking for references to concise overviews of these (and other) revolutions of communication, with a strong theoretical background (comparing and relating them to each other) that possibly give an outlook what might come next.