This essay provides an overview of social media theories relevant to interactive marketing. It examines Hofstede's theory of cultural difference, focusing on its six dimensions: power distance, individualism vs. collectivism, masculinity vs. femininity, uncertainty avoidance, long-term orientation, and indulgence vs. restraint. It further discusses social influence theory, covering conformity, compliance, and obedience, and media richness theory, which explores the capacity of media to convey information based on uncertainty and equivocality. The essay contrasts these theories, highlighting their strengths and weaknesses in practical applications, and concludes by emphasizing the importance of understanding these theories for making informed decisions in interactive marketing.