The article analyses the phenomenon of linguistic deviations in online communication, including both linguistic errors and deliberate innovations. It presents the characteristics of the language in the digital space, drawing attention to the speed of communication, user anonymity and the use of abbreviations, neologisms and emoticons. The analysis of online comments revealed the most common deviations from the norm, including starting sentences with a lowercase letter, omitting or using punctuation in a non-standard way, spelling mistakes, and pleonasms. The potential causes of these phenomena were discussed, as well as their possible effects, including permanent changes in the perception of linguistic norms and the development of new forms of communication. The role of education, social campaigns and self-education in maintaining a balance between the innovation and creativity of social media users and the care for linguistic correctness were emphasised.