The document discusses several key theories related to social networking and media effects. It summarizes:
1) Three commonly used media effects theories in political communication: framing theory, agenda-setting theory, and priming theory.
2) Four narrative persuasion theories: social judgement theory, elaboration likelihood model, cognitive dissonance theory, and narrative paradigm.
3) A brief history of major social networking sites from their inception in the 1970s to modern platforms like Facebook, Twitter, and Snapchat.