I hate to be blandly negative, but this deserves (deserved?) it. This is dumb. Message boards had this property, as did blogs. There is nothing meaningful in this short essay.
Edit: if you think message boards and blogs were too specific, here are a couple of other media with this property: radio and television.
Edit: if you think message boards and blogs were too specific, here are a couple of other media with this property: radio and television.