- The document discusses various theories related to the effects of mass media from the 1920s to the present. It covers powerful effects theories from the 1920s, limited effects theories from the 1960s, and moderate effects theories from the 1970s.
- More recent research discussed includes studies on the influence of TV media tone and visibility on party choice in the 2007 Danish election, how opinion leaders differ from others in their media use, and uses and gratifications theory.
- The document also contains case studies on media use during Singapore's 2011 general election, including findings that television and newspapers were most widely used and that online political blogs saw increased readership. It examines agenda setting and the higher trust in traditional vs new media sources.