The increasing number of social network sites (SNSs) and their changing nature raise the question of why people use SNSs. This research has a twofold objective: first, to develop a new motivation scale for using SNSs, second, to compare the utilization of five SNSs (Facebook, Instagram, Twitter, Snapchat and LinkedIn). Two studies on 364 university students, using exploratory and confirmatory factor analyses, established 6 motivations for using SNSs: entertainment, social interaction, seeking information, instrumental use, self-documentation and self-enhancement. Contrary to previous studies, Facebook use was not related with social interaction or self-enhancement. Like LinkedIn, the use of the platform was rather associated with peer pressure. The results also revealed that new practices, such as “social selling”, affect the motivations for using SNSs. For instance, Instagram and Snapchat were mainly driven by instrumental needs. Finally, in line with the literature, Twitter was mainly used to satisfy informational needs. The results are discussed in light of new motives behind SNSs use and differences in using specific SNSs.