In the early 2000s, a new genre of music broke into the mainstream and begandominating popular music charts. The fans called it emo, and it became known as the latest iteration of the emo genre from the ’80s and ’90s. In this thesis, I explore the relationship between fans and emo music, clarifying the genre’s variety of definitions and interpretations while also identifying the types of discourse and the “productive” fandom practices in which fans participate in online emo community. I consider how early online fandom communities were formed and examine various online emo communities as digital archives containing emo discourse, emo fan fiction, and fan-written music reviews. Analyzing such archived materials from internet sites such as Pinterest, Tumblr, and LiveJournal is an important next step in emo fandom studies because these digital archives reveal significant areas of discourse within emo communities ranging from terminology and genre classification to modes of participatory fandom like fan fiction to conversations about mental health. I consider these topics from all sides, balancing fan testimonies with media narratives and scholarly commentary. By focusing on the mental health crisis in online emo fandom, the fan content that emo fandom inspires, and different approaches to defining the genre of emo, this thesis contributes to the study of a unique musical subculture that shaped the lives of a generation of teenagers. It will also illuminate the essential role that the internet plays in the formation of subcultures and teen identities by exploring the past and present existence of this online fandom.