The document summarizes three audience theories: 1) Hypodermic Needle Theory: Audiences are seen as passive recipients who are powerlessly injected with ideas from media like a hypodermic needle. 2) Two-Step Flow Theory: Information from media flows not directly to audiences but through opinion leaders who influence others. 3) Uses and Gratifications Theory: Rather than how media affects people, it focuses on what people do with media and how they use it to fulfill personal needs like diversion, relationships, identity and surveillance.