Based on the definition of knowledge as commons, the aim to the paper is to investigate the impact of nudges and considerations stemming from behavioural economics on the promotion and enhancement of commons. Commons are described as goods (material and immaterial) belonging to specific community or to humanity as a whole, and we believe that an approach based on nudging individuals toward desired behaviours may be more effective than top-down policy actions that may be perceived as excessive. In order to answer our research question, we will analyse a case study regarding the network of public libraries in Rome, called Biblioteche di Roma (BdR). BdR launched its online platform in 2009, but it was never able to create a strong connection with offline activities, and contributions by readers (such as comments and ratings) remained very low. In 2018, BdR introduced a gamification section in its website, with the goal of increasing users’ interactions and book circulation. We will present and analyse data resulting from the use of gamification, both at city level and within different neighbourhoods. Finally, we will provide suggestions for introducing additional nudges in BdR’s gamification strategy, and will make considerations regarding policy implications and paths for future research.