The purpose of this study is to overview the general use of social net-work sites (SNs) in Turkey in higher education students, and to examine how this usage relates positively and negatively to their work, study, social life, cognitive development, social development, physical development and sense of security. The study is designed with a descriptive approach to display current situation of SNs usage in Turkey. The data is collected through an online survey. The results highlighted that "gaining up-to date information" and "learning new information and knowledge" are the most positive ways to organize their work, study and social life in participants' SNs usage. It is also remarkable that the average scores for positive aspects of SNs have on students' lives, is higher than the negative aspects that SNs have, according to the opinion of the students. But, it is clear that results of negative effects showed that "increasing privacy concerns" is the most important security factor.