Due to the developments in information and communication technologies, changes in social life, social relations and social communication are occurring. According to studies, the number of internet and social media users is increasing day by day. Freedom of speech implies freedom of expression of a thought, opinion, attitude or feeling in a peaceful way, or freedom of expression in the outside world. Social media is seen as the private space of people, and people freely express their thoughts this way. However, workers conveying the complaints about their jobs, or the criticisms against their employers via social media, can lead to termination of employment contracts. There are no special regulations for the issue of social media and employment in countries such as the United States of America, Canada, the United Kingdom, and the Republic of Turkey, and the existing regulations in labor law are also applied in this area. Judicial decisions are important because they serve as a guide in these matters. Nevertheless, it would be appropriate to carry out the necessary regulations on the effects of social media speaking on employment contracts in the domestic legislation of countries as soon as possible.