Social networks allow people to connect with each other regardless of distance. The most popular social network is Facebook, and the key to its success lies in an advanced algorithm responsible for displaying content and maintaining a positive user experience. The number of users of the most popular social networks is growing and the trend is expected to continue. The work is organized through an overview of algorithms for displaying content on different platforms, an analysis of the history and evolution of the Facebook algorithm, the implementation of a survey among users and the evaluation of the collected data. The results show that the majority of respondents use Facebook several times a day, but a significant number of users are not satisfied with the displayed content, especially sponsored posts. Also, a large number of users feel uncomfortable due to the perception of „eavesdropping“, which negatively affects trust in the platform. The algorithm stands out for its ability to adapt and evolve, but user satisfaction is not always at a high level, indicating the need for further improvements, especially in the personalization of ads and content to increase user satisfaction. In conclusion, although Facebook's algorithm uses advanced techniques to personalize content, there are significant challenges in ensuring high user satisfaction and maintaining user trust. Future research could focus on a deeper understanding of the long-term effects on the development of young people.