Social network sites, such as Facebook, allow access to a series of resources or discursive forms that constitute a multimodal and dialogical system that transcends barriers of time and space, favouring transnational communication, something particularly important to migrants. In addition, the comments and dialogues that take place in such socialisation spaces allow us to develop a greater knowledge of the identity and positioning of the user with respect to others. With this work we analyse, from a qualitative point of view, 150 posts each containing at least five comments, published between 2017 and 2019, in each of five Facebook groups of Latin American migrants living in Italy: Uruguayans, Argentinians, Colombians, Peruvians and Venezuelans. We determine their role in the migratory process and how the digital environment affects the relationships between migrants. In addition, we investigate how the identities of migrants are negotiated and (re)defined in discursive practice. Results shows that social network sites are “transnational social spaces”, in which a community is based on bonds of solidarity that derive from a shared conception of collective identity, and they forge deterritorialised “community of feeling”.