This study presents an empirical research, which examines how scientific social networking sites can support researchers' work. In particular, the study investigates knowledge sharing behaviors of users of the scientific platform ResearchGate. A questionnaire was distributed to members of the social network. One hundred and fifteen responses were obtained. The results of this study provide a profile of scientific social networks users. Users consider these platforms mainly as a means to communicate their results and their knowledge. The level of utilization of knowledge obtained from these social networks is still low.