The document discusses several theories of audience development in media studies: 1) The Frankfurt School's "effects model" from the 1920s-30s viewed audiences as passive recipients susceptible to media messages. 2) The two-step flow theory from the 1940s-50s found people are more influenced by opinion leaders who interpret media for friends/family. 3) Uses and gratifications theory from the 1970s found audiences actively consume media to fulfill different needs like diversion, social interaction, and identity exploration.