Focusing on the topic of the development of the plurilingual and intercultural competence through the integration of electronic communicative practices both in foreign language classrooms and non-formal contexts, this work aims at defining and characterizing, in view of a co-actional perspective, a "pedagogical blog", by considering it from three different axes: a personal and social dimension, a collaborative and co-actional dimension and the management of linguistic and cultural repertoires dimension. In order to do so, this contribution presents and describes a case study which will highlight how blogs can be used in order to develop plurilingual and intercultural competences: we will present the classroom dynamics developed by the blog "Falar pelos cotovelos", a year-long project created within the scope of the teaching and learning of Portuguese as a foreign language, in a non-formal setting (non-scholar public). Throughout the discussion of this purposeful sampling, our analysis will allow us to consider pedagogical blogs as means of socialization, as instruments at the service of exolingual interaction and as time-spaces for languages and cultures.