Discourse is one of the most understudied area in linguistics. It has a specific meaning and function in various areas of science, in linguistics there are three models of correlation in discourse and text. The main research problem of discourse is the absence of strict borders between different types of discourse. We single out public discourse as one of the broadest types of discourse the main feature of it is the coverage of the audience. Considering this feature of the public discourse we took the material of study from the biggest video hosting platform Youtube. Phraseological units are sophisticated lexical components of any language that have semantic, syntactic, and pragmatic functions. This article is an attempt to make a quantitative analysis of phraseological units that belong to different stylistic layers (formal and informal) and the way they are used in public discourse. Quantitative analysis allowed researchers to describe a distribution of phraseological units in topical areas.