see The Space Merchants (1952)

Bernays (IIRC) goes into detail about how detailed segmentation (a century ago, they had to hand-craft theirs, often with the help of push polling) is useful to "triangulate" a targeted segment by saturating neighbouring segments (pre-astroturf astroturfing).

For ad buyers this is a great marketing piece. I would predict an uptick in new ad buyers after seeing the article