In current society, Digital Technologies (DT) are powerful pedagogical resources, however, they require special teacher training. This paper analyzes a case study carried in a subject given in a lato sensu post-graduation course for teachers. The program promoted the discussion of the use of DT, and used an Internet social network (ISN) to support activities. Therefore, this article aims to analyze difficulties and advantages of the use of ISN in teacher education programs. The study starts with a reflection of the importance of training teachers in the use of DT and the pedagogical use of ISN. Following, the case study is contextualized, and the methodological procedures are described. The paper closes with a discussion of the difficulties and benefits of social networking based on data derived from the observation, questionnaire and students’ posts on the network. Despite the difficulties, use of the ISN was considered a positive one.