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> It wasn't until the '80s that we got a fairly solid (and popular) understanding of the mechanisms of broadcasting

Curious what you mean by "the mechanisms of broadcasting" here--what discovery/formalization/legislation/else do you mean?

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There is a massive library of analysis on the effects of broadcasting, from McLuhan to Eco. Most of it was put together in the 60s/70s and became popular outside academic circles in the 80s.

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