The Hypodermic 'needle' theory implies mass media have a direct and powerful influence over passive audiences. The word needle refers to how it 'injects' (like a drug) information that will affect the recipient. It is said that media text changes the behaviour of the consumer. The theory came about in the 1940/50's after the sudden expansion of radio and television industries (media industries) whereby societies were exposed to more advertisement and propaganda. Evidence of this theory being valid, would be the Nazi propaganda (masterminded by Goebells) which indoctrinated millions of people, causing people to support such an evil regime. The population (with regard to this theory) is seen as a sitting duck.
Two Step Flow
This theory believes that information from the media moves in two distinct stages. First, individuals (opinion leaders) who pay close attention to the mass media and its messages receive and revise the information. They then pass on what they have learned to a more passive audience. They can be seen as a middle man between the mass media and audience.
Uses and Gratifications thoery
This is a widely accepted theory when understanding mass communication. It expresses the view that consumers are not passive, rather, they take an active role in interpreting text. Furthermore, the theory assumes that audiences use the media to fulfil specific gratifications and that people are responsible for choosing media to meet their needs. Critics claim that this is not the case; audiences cannot necessarily choose what they watch, read or hear as they are not in control of what is being produced.

