Abstract
This paper examines the possible integration of online social networks into libraries and their consequences on information practices and digital identities. Focusing on digital identities and resorting to the notion of “alter-documentation” offers new avenues for the design and use analysis of such mechanisms. Document-sharing favors reader commitment as it participates in the process of digital self-presentation. The model of followed/follower interpersonal relationships is more conducive to knowledge-sharing activities than the model of mutual validation.