Fig 4. K-core decomposition of the July 2019 semantic networks for the DX (top left) and the CSX (bottom left) partisan communities.

The k-core decomposition reveals the bulk of the discussion about immigration developed by these two partisan communities: while the innermost core of the DX-induced semantic network (top right figure) is composed by hashtags like #salvininonmollare (‘Salvini don’t give up’), #arrestatecarolarackete (‘arrest Carola Rackete’), #iostoconsalvini (‘I stand with Salvini’), that of the CSX-induced semantic network (bottom right figure) is composed by hashtags like #salvinidimettiti (‘Salvini resign’), #fateliscendere (‘let them get off’), #carolaracketelibera (‘free Carola Rackete’).