Broadcasting, Narrowcasting, and Nullcasting
The rise of Cable allowed many more channels and the advent of niche marketing, whereby a given channel devoted its program content to some narrowly construed demographic audience.
Today, webcasting technology is so ubiquitous that anyone can become an online publisher or webcaster with essentially zero capital investment.
With so many people publishing personal blogs or running personal audiocast stations, we've gone well beyond broadcasting and narrowcasting to nullcasting.
Nullcasting is where no one is listening (not even the robots which tirelessly index these sites).
I used to go to dreadful departmental meetings where the dominant practice was that everybody wanted to talk and nobody wanted to listen.
Now we've achieved that goal in spades. We can all nullcast to our heart's content.
And then, when we finally notice that no one is actually listening to our nullcasts, we can go back to being as alienated, isolated, and broken-hearted as ever.