This article presents a narrative literature review on social media and e-reputation, highlighting their increasing importance in the digital world. The objective is to examine current theoretical approaches to the concepts of social media and e-reputation. After defining the concepts of social media and e-reputation and explaining their evolution, the article explores key theories. For social media, it examines engagement theory, social network theory, and online identity theory. For e-reputation, it addresses reputation theory, online trust theory, and online responsibility theory.By synthesizing these approaches, we compare different theories to identify gaps in the current understanding of the concepts and propose future research directions to enhance understanding of social media and e-reputation concepts.In conclusion, we summarize the main conclusions of our literature review.