Before revision:  In the present paper, we aim at filling this gap by , first, identifying the discursive communities that animate the political debate in the run up of the 2018 Italian Elections and, then, studying the semantic mechanisms that shape their internal Twitter discussions .
After revision:  In the present paper, we aim at filling this gap by , first, identifying the discursive communities that animate the political debate in the run up of the 2018 Italian Elections as groups of users with a significantly-similar retweeting behavior. Second, we study the semantic mechanisms that shape their internal Twitter discussions .