The issue of the limits of acceptable criticism of an employer by an employee has been considered in case law and literature for a long time. However, with the widespread access to the internet, in particular to social media, there are new challenges in this area. The paper addresses the problem of permitted criticism of an employer posted by employees on the internet. The author seeks an answer to the question of whether the existing criteria developed in the doctrine and jurisprudence, which are used to determine the limits of criticism, are also appropriate in the case of an employee’s statements published in a virtual space, which is characterised by its public nature, the lack of control over the audience and the persistence of the content.