The ethical aspects of advertising on social networks was researched problem in this graduate paper. Social networks are used by 3.5 billion people today, in addition to their original role of communication, they also have a marketing role, by promoting other websites and a range of different services. Ethical standards such as laws, regulations and policies that govern privacy, personal data collecting and the protection of the user's personal data are important both when using and advertising on social networks. The theoretical paper part defines the ethical issues of social networks, ways to protect personal data and privacy of consumers, the social network ad specifics from the company point of view and the user point of view of advertising ethics on social networks. The theoretical paper part is based on professional literature sources and internet sources. When writing the paper, the method of description was mostly used in describing the advantages and disadvantages, policies, characteristics and examples. The research part of the paper includes research and analysis of opinions and attitudes of young people about advertising on social networks through an anonymous electronic survey on a sample of 150 young people. Before conducting the research, the following four hypotheses were set: young people have a negative attitude towards advertising on social networks, young people think that ads on social networks encourage them to buy, young people think that they are shown ads intended for them, young people think that social networks are oversaturated with ads. These hypotheses were accepted or rejected according to the results of the research. The results of the survey show that less than the majority of young people (32%) believe that ads on social networks encourage them to buy, the largest share of respondents is undecided (37,3%) on this issue. Furthermore, most young people have a negative attitude towards advertising on social networks as 85,4% of respondents fully agree or agree that the experience of using social networks would be better if there were no ads on social networks at all. Valuable research findings are that 76,7% of respondents believe that they always, often or sometimes get an ad after talking to someone on the phone about a product or service, and that as many as 91,3% of respondents think that social networks are overloaded with ads.