This study investigated what Swedish public and academic libraries expressed on their Facebook pages. This study looked at similarities and differences between public and academic libraries through the lens of the Four spaces model by Jochumsen et al. (2012). Data was collected from three public and three academic libraries’ Facebook posts. The data was analyzed through qualitative content analysis, inspired by Zhang and Wildemuth (2017). 

The results indicated that Facebook was used partly in different ways in public and academic libraries. Public libraries used Facebook to promote literature, human rights, and they also focused on posts for younger audiences. The academic libraries mostly focused on helping students with their studies. There were also some differences within the same library type; for instance, one of the academic libraries did not focus on content for students.

The four spaces model Jochumsen et al. (2012) considers the changing roles of the public library in society and how libraries can show legitimacy in their new environment. Results indicated that the public libraries primarily expressed the learning space, and secondarily, the inspiration space. Academic libraries mostly expressed the learning space. The meeting space and the performative space were seldom expressed, both in public and academic libraries.