The article is focused on the topic of self-injury as phenomenon, appearing on blogs (on-line diaries) of nowadays adolescents. The goal of this research was to understand the problematics of self-injury itself and motivation to write about self-injury in public area of blogs and also it focuses on the question of potential emerging of on-line community of self-harmers. In adolescents, who had an experience with self-injury, we focused on their motivation; how they take self-injury and what role does internet and blog play in self-injury. This research is of explorative character - with the usage of grounded theory method there was 9 semi-structured interviews with girls of the age of 15-18 analysed. The research showed that blog community connected by self-injury issue is being looked upon by the respondents as supportive, has a tendency to refuse help from the outside togehter with strengthening the negative feelings about proffesional help. Internet, let us say blog, act as important agents in spreading information on self-injury. This fact is especially important in light of the phenomenon of potential social contagion of self-injury.