The article discusses the use of social media in the creation of sense directed to knowledge production based on political polarization in the United Kingdom and Brazil. It analyzed the content of the manifestations presented in Twitter hashtags on the Brexit and the impeachment of 2016. In the social media, the study evidences polarized, but distinct behaviors: in the United Kingdom the effects of the decision stand out and, in Brazil, the positioning involved in the issue. It is concluded that in these contexts of polarization, social media intensify the debate and diversity of opinions favorable to the democratic process and the production of knowledge stimulated by ambiguity.