Nowadays, due to the rapid growth of social networks, the possibility of various threats is increasing, one of which is fake accounts. The use of machine learning in the issue of identifying fake accounts on a social network is considered. The main goal of the work is to research and develop methods and models of machine learning for the effective detection of fake accounts in social networks. This avoids problems such as extortion, blackmail, harassment, fake requests, insulting a person, unauthorized access to personal information, illegal use of user information through research. The object of the study is fake accounts. Methods used in the research work: scaling methods, machine learning methods, feature selection methods, model evaluation methods. The subject area of the research work is Instagram. The uniqueness of the study is to determine the most reliable way to detect fake accounts using various, widely used methods. Machine learning classifiers were effectively used to detect a fake account: decision tree classifier; classifier KNN; logistic regression classifier; random forest classifier; support vector machine (SVM) classifier. The performance of the models was evaluated using various indicators, such as accuracy, ROC-curve, classification score. Some models, such as Decision Tree, Random Forest, and KNN, have shown stable and high AUC-ROC, Accuracy, Precision, Recall, and F1 scores both during initial testing and after retraining. This highlights the importance of choosing the right features when training a model and shows that not all features are equally useful for all models. As a result of the study, after verifying the effectiveness of using machine learning algorithms to identify fake