This article provides a comprehensive overview of the history of social media, starting from the development of networking technology in the 1960s to the emergence of popular social media platforms like Facebook and Twitter. It explores different types of social media sites, such as social networking sites, media sharing sites, blogs, micro-blogs, social bookmarking sites, and wikis. The article also discusses the role and importance of social media as a new marketing tool, particularly for small and medium-sized enterprises (SMEs). It highlights the advantages and disadvantages of social media marketing and provides insights into effective management of social media as a marketing tool.