The audience is divided into groups by location, culture, sex, age, education, and other factors. Sometimes particular sections of the audience are similar as to these factors, and sometimes a particular section of the audience is composed of dissimilar spectators.
Audience reaction depends on the composition of the audience.
The Internet has joined together, by direct communication, people in very different sections of the audience allowing them to compare their thinking about the performance they are seeing. THIS CHANGES (and slowly homogenizes) THE PERFORMANCE AND THE AUDIENCE as it continues.
It also gradually changes the critical opinions of members of the audience –
And of the Performers.