This dissertation consists of a qualitative and interpretive research in the field of Internet and politics, subfield digital democracy, and focuses on the analysis of public communication practiced in a digital democracy experience developed in Brazil between 2015 and 2016: the Federal Government’s Dialoga Brasil. In order to carry out the research, the Critical Discourse Analysis (ADC), the Social Semiotic Theory of Multimodality (TSSM) and the Systemic-Functional Linguistics (LSF) were mobilized, especially in the analysis of the frames of institutional commercials broadcast on TV and the internet. The results obtained by the platform, in terms of access and participation of the public, advertising pieces collected in the digital medium and, finally, the project website were also analyzed. The results obtained by the research and the resulting interpretation suggest that in the publicity pieces mobilized by the Dialogue Brazil portal there is a deliberate effort to strengthen the government s brand in detriment of public communication - referenced in the constitutional function of institutional advertising - able to inform and to provide arguments for public debate about issues of general interest. The present research in the field of internet and politics is justified by the current perception, within the literature that deals with the evaluation of e-participation experiences, that public communication represents a central aspect in initiatives of this nature.