The document discusses several theories of how media targets and affects audiences: 1) The "hypodermic syringe model" from the 1920s-1950s viewed audiences as passive and assumed media had direct effects, like propaganda during WWII. 2) The "two-step flow model" developed in the 1940s-50s recognized opinion leaders could influence audiences' reception of media messages on social media today. 3) "Uses and gratification theory" sees audiences as active in interpreting media to fulfill personal needs like identity, education, entertainment and social interaction.