This Master's thesis outlines some basic concepts, which were the basis for further research work, namely the core concepts of pragmatics and stylistics, key terms of theory of the genre and important aspects of the analysis of the pictorial components of communication. It further presents the main features of web texts, which are primarily characterised by hypertextuality, multimedia and topicality. Additionally, the basic concepts of blog and characteristics of social network Twitter and Instagram have been discussed. In the second part of the work the online posts of Jonas Žnidaršič have been analysed from the perspective of the basic concepts. The author has published his texts on his blog, Futer, and on Twitter. We have thoroughly analysed six of his texts published on his blog, four of which were newer and two older, and his tweets published over the period of one year (from April 2015 to March 2016), which link up with his Instagram publications too. The texts were analysed using critical discourse analysis methodology and both, textual and non-textual elements were analysed. The author presents his opinion or starts a discussion on current topics creating evaluative and polemical types of text. In the analysed texts Žnidaršič affirms his highly developed linguistic competence; his style of writing is humorous and relaxed and both of these elements are conveyed through language choice, mainly with premeditated lexical and syntactic deviations from norm.