The document discusses different audience profiles for various media. It defines the hypodermic needle model of communication as suggesting a direct transmission of message from sender to receiver. An example is given of Orson Welles' 1938 radio broadcast of "War of the Worlds" that was mistakenly believed to be a real news report of a Martian invasion by many listeners. The document also discusses different motivations people have for using various websites and platforms, such as to find information, keep personal files, socialize, and entertain themselves.