The failure to create a European public sphere that contributes to the shaping of common values and the strengthening of the construction of Europe's identity is a long-debated issue. In these times of polarisation and illiberal exclamations in the political arena, the constitution of such a public sphere and the role of European political parties become even more important. With an original database that collects the social media activity of the main European political groups, the national parties that make them up and the candidates who ran in the last elections to the European Parliament in 2019, the aim is to demonstrate to what extent these formations are able to set a common agenda in the discourse of the campaigns or it is the scenarios of the national competition that set the tone.