Fanfiction is a widely known phenomenon and has been researched in different disciplines other than library and information science. Such studies explain that fanfiction is popular among young people (Olin-Scheller & Wikström, 2010). However, there’s a lack of research within the field of library and information science that brings attention to fanfiction activities at libraries. This thesis aims to shed some light on the reasons behind fanfiction activities at libraries. Eight semistructured interviews with librarians who have held or planned a fanfiction activity for young people were conducted. The interview material was analyzed through a qualitative contentanalysis and coding based on The Four Space Model by Jochumsen, Hvenegaard and Skot-Hansen (2012) and brought to light by previous relevant research. The empirical results show that the librarians were familiar with fanfiction previous to arranging the activities. The results also show that the librarians conducted the activity either based on their own personal interests or because it was requested by young library users. The fanfiction activities were usually focused on the writing aspect of fanfiction or that they could attract young people to the library. The results explain that the activities simulate reading and creativity, but fanfiction activities can also encourage participation, making the library work as a meeting place that encourages both reading and writing for young people.