[gryn]

This is older than the ideas of the internet itself.

Channels get saturated and marketers start looking for new ones with les noise/competition.

The oldest that I can think of is old school markets where is shops yells to tell you how good of a deal you're gonna have if you buy from them. I think they date back to the middle ages, no?

[mlhpdx]

Older, almost certainly. The discovery of advertising murals and graffiti in Hereculum makes me smile a little. Humans have been humans all along.