The emergence of the internet and the constant improvement of Information and Communication Technologies (ICTs) over the last three decades, in Brazil, as in the rest of the world, the reconfiguration of the public sphere in which are discussed, also observing that individual, social, political and economic interests intertwine and appropriate each other in the creation and maintenance of spaces for discussions, which, in turn, are widely used as boxes of resonance so that the most varied issues echo through society; this is the case of the social network known worldwide as Twitter. Thus, combining it with the necessary complements extracted from the works of contemporary authors such as Eduardo Magrani and Evgeny Morozov, it is essential to resort to the theory of Jürgen Habermas in order to understand the configuration, importance and problems of the current national public sphere, as well as how to draw conclusions about the rationality of the political debates held within the Twitter platform, demonstrating that, under the pretext of providing a space for the realization of everyday communicational praxis, the platform actually instrumentalizes interests, and, consequently, promotes the colonization of the lifeworld of its users. Furthermore, due to the pragmatic-formal character of the Habermasian theory, it is also demonstrated how an influential political agent can strategically use the platform to advance its own interests through the analysis of some of its manifestations.