論文アブストラクト：With its roots dating to popular television shows of the 1960s such as Star Trek, fanfiction has blossomed into an extremely widespread form of creative expression. The transition from printed zines to online fanfiction repositories has facilitated this growth in popularity, with millions of fans writing stories and adding daily to sites such as Archive Of Our Own, Fanfiction.net, FIMfiction.net, and many others. Enthusiasts are sharing their writing, reading stories written by others, and helping each other to grow as writers. Yet, this domain is often undervalued by society and understudied by researchers. To facilitate the study of this large but often marginalized community, we present a fully anonymized data release (via differential privacy) of the metadata from a large fanfiction site (to protect author privacy, story, profile, and review text is excluded, and only metadata is provided). We use visual analytics techniques to draw several intriguing insights from the data and show the potential for future research. We hope other researchers can use this data to explore further questions related to online fanfiction communities.