Consumers carry mobile devices with them anytime, anywhere. So companies have to develop new marketing channels to reach their customers. Especially seeing the intense interest in social media by young people, marketers add the social media applications to their marketing strategies. Consumers who follow spotlight developments, technological developments and fashion are young consumers. Also young people are the consumers who are the most interested in mobile technologies too. For that reason, the purpose of this study is to identify the effect of the mobile social media on young consumers' consumption expenditure. For this purpose, a questionnaire was administered to university students. The results were analyzed with SPSS software