An influential literature underlines how much parliamentary communication of European Union (EU) affairs could offer to democracy in the EU. Yet members of parliaments (MPs) seem unmoved by their potential. MPs are strategic about their communication, and this study questions the suitability of EU affairs to their re-election strategies. Analysing the messages posted on Twitter by regional and national MPs from Ireland and the United Kingdom over a four-month period, this article shows that clear electoral safety and strong political responsibility increase the communication of EU affairs. This suggests that the low electoral benefits and the high political complexity of EU affairs are significant deterrents to parliamentary communication of these affairs. As a result, the voices of Eurosceptic MPs echo disproportionately louder on Twitter.