Human eras defined by modes of communication

The above video presents four eras of human communication from an evolutionary perspective where there was a long time when humans only gestured and grunted, then there was a long time when humans spoke but did not write, then a long time when people wrote. The useful information is the progression of information content possible with each era. The unnecessary information is evolutionary explanation. For this discussion to work, there doesn’t have to be a specific period of time when human culture flourished with illiterate people fluent in verbal languages. There are clearly expansions of content starting with gestures, then adding verbal languages, then adding written languages. The Internet era allows us to publish and retrieve information separately from the story-telling.