Exposure diversity is a relatively new and as yet to be explicitly formulated objective of contemporary media policy. While it holds certain potential—in particular in the messy digital space characterized by abundance and exponentially increased user choices—it comes with certain risks too. The role of public service media in ensuring exposure diversity is an underexplored yet important topic of media policy and law. This article introduces the special section on public service media and exposure diversity in the International Journal of Communication and outlines the key motivation behind it. It briefly presents the main contributions and a summary of their arguments, as well as the red line that holds them together.