Social networks have become increasingly important in the socialization of adolescents, and in the last twenty years they have been increasingly influencing their development. Social networks have the most significant influence on the process of adolescent socialization, that is, on the adoption of cultural values, attitudes, beliefs and social norms. The accelerated development of social networks in the 21st century has changed the way adolescents learn and spend their free time. The advent of the Internet and globalization have changed consciousness, communication and relationships. The Internet and social networks have become part of everyday life, breaking down the boundaries of time and space, the boundaries of cognition have long crossed the boundaries of community and culture. Social networks are no longer used solely for private publication and socializing, but are increasingly becoming a relevant tool for monitoring key news and information and for educational content. The paper explores the extent to which adolescents in the City of Zagreb use social networks such as Facebook or Instagram to share educational content, information and school materials. Research has shown that with the emergence of contemporary, personalized media that adolescents use, they themselves become information, news or cultural content. With frequent use of smart devices and the Internet, adolescents are more dependent on media content, receiving a wealth of information, unreliable news, lack of culture, the possibility of plagiarism and even media violence. In this way, adolescents, as the most vulnerable group of society, are put in a subordinate position vis-à-vis the media. Education is necessary to empower adolescents to use social networks properly.