The main aim of this chapter is to analyse under‐determination, generalisation, vagueness, and ambiguity in the speaker's self‐reference strategies used in Catalan parliamentary debate and Twitter. Parliaments are one of the main arenas where politicians develop their activity. On the other hand, Twitter allows politicians to build their own public image and to be in touch with voters, and citizens in general, in a more direct way. The theoretical background of the analysis includes the classical studies on deixis and on person deixis in Catalan; Goffman (1981)'s participation frameworks; functional linguistics and the ethnography of communication, and Twitter communication analysis. In this corpus‐driven analysis, parliamentary discourses and tweets of two members of the Parliament of Catalonia are analysed. The corpus has been drawn from their speeches in the 2020 general politics debate and from the Twitter messages they published in the same period, in autumn 2020. [ABSTRACT FROM AUTHOR]