The topic of this final paper is "Protection of Privacy on Social Networks". The paper defines the concepts of privacy and personal data and the importance of their protection on social networks. Social networks have generally changed the way of life, and with their development, there have been various dangers and threats to privacy and development of malware. It is important to pay attention to the fact that any information published on social networks remains on an Internet server forever, even after it is deleted. In addition to people who use social networks to communicate with others and follow interesting, educational, or entertaining content, and to post textual content, pictures or videos, there are also people who use social networks to harm others. Some of the most common threats are phishing, spam, hoax, malware - ransomware and spyware stand out, as well as identity theft, loss and deletion of personal data and sharing inappropriate content. Therefore, one should be careful when publishing personal information, when logging into other accounts via social networks. It is important to use strong passwords and not to open suspicious emails and messages. Also, it is important to always follow the rules of communication when corresponding or posting content on social networks, online groups, portals, forums and so on.