This study is an attempt to investigate how cultural contexts determine the use of communication technology by examining the motivations and patterns of using SNS, mainly "Instagram" among teenagers from Turkey and Germany, through a survey. The survey data of total 340 participants were analyzed by using reliability analysis, t-test and Chi-square test. According to the results of the research, Turkish students use social-media with significantly higher motivations of Seeking-Friends and for Entertainment while German students had greater motivation for Seeking-Information. Turkish students have been using Instagram for a longer time and following more accounts in Instagram than German students. While Turkish students use Instagram, LinkedIn and Twitter more, German students use Whatsapp and Tiktok. While Turkish students follow Kim-Kardashian and Kendall-Jenner more, German students follow Cristiano-Ronaldo and Neymar significantly. Turkish students share their posts in Instagram-Stories and use their accounts as private more than expected compared to German students. Turkish students use their real names and spend more time daily in Instagram compared to German students.