This paper investigates students’ awareness and familiarity with “visible” and “invisible” threats of online privacy on social networks. Students were selected as representatives of the younger population that actively and daily use social networks for seeking information, communication and self-actualization. Current interest in privacy protection on the Internet can be explained by the recent Facebook scandal that has revealed how personal information can be misused to manipulate and guide consumer and election behaviour. This paper focuses on the ethical issue of the aforementioned and explores student attitudes and opinions. The study was conducted on a sample of 140 students of all years of journalism study, on the Faculty of Political Science in Zagreb. Used method was written survey and the results were analyzed in the program for statistical analysis in social science (Statistical Package for Social Sciences). The study found that more than three-fourths of the students are concerned about their online privacy “to a certain extent” or “not too much”. Also, students pay more attention to “visible” privacy threats associated with unauthorized access to the content they share on social networks from people who are not on their list of friends/followers. Their most common privacy protection mechanism is having a private account on social networks. Students claim to be aware of “invisible” privacy threats such as tracking their online activity, preferences and interests on social networks or sharing their personal information with third parties without their knowledge, but only a few actively and frequently work to protect their personal data from misuse.