CONCEPT
Communication Channels
The means by which messages about innovations travel between individuals — mass-media and interpersonal channels operating with different dynamics at different stages of the innovation-decision process.
Communication channels are the mechanisms through which information about an innovation flows through a social system. Rogers distinguished two broad types: mass-media channels (television, newspapers, and now digital platforms), which efficiently reach large audiences but have limited persuasive power; and interpersonal channels (face-to-face conversation and its mediated extensions), which reach fewer people but produce deeper influence. The two types play complementary roles: mass media is effective at the knowledge stage of the innovation-decision process, interpersonal communication is effective at the persuasion stage. The AI transition has introduced a third category that Rogers did not anticipate — algorithmic curation — whose dynamics are still being worked out.
In The You On AI Field Guide
Rogers distinguished not only mass-media vs. interpersonal channels but also cosmopolite vs. localite channels. Cosmopolite channels bring information from outside the local social system; localite channels circulate information within it. Innovators rely heavily on cosmopolite channels; the majority relies on localite ones.
The two-step flow model integrates these channel types: mass media (often cosmopolite)