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Twitter is nowadays a powerful means of political propaganda. Its effectiveness can be easily appreciated in the large amounts of messages exchanged by politicians every day. This wealth of data, together with the interactive nature of the social medium, provides an ideal basis for the analysis of a striking feature of political messages, i.e., their implicitness, often achieved using presuppositions, among other strategies. The present work proposes a comparative analysis of British and Italian politicians' use of Twitter by focusing on implicit communication (notably, presuppositions) and the pragmatic functions of tweets. Based on a sample of about 400 tweets, our analysis shows that some of these functions tend to associate either with presuppositional or non-presuppositional communicative devices. Moreover, a critical methodological discussion is offered in order to address the main challenges of quantitative corpus-based pragmatics.