This paper examines the evolution of social networking sites (SNS) from their inception in the late 1990s to the present, highlighting the transformative impact of artificial intelligence (AI) on user experiences, content recommendation, and engagement. Key platforms such as Facebook, Instagram, Snapchat, Twitter, and TikTok are analyzed to illustrate how they have reshaped communication and societal norms. The discussion emphasizes the personalization of content through AI algorithms, enhancing user retention while raising ethical concerns regarding data privacy and potential biases. The paper advocates for a nuanced understanding of user behavior and platform dynamics, urging the integration of ethical AI considerations in the design of future SNS. It also calls for interdisciplinary research to explore the implications of emerging technologies such as IoT, big data, and blockchain on social networking, ultimately aiming to foster decentralized systems that prioritize data privacy and governance.