Аннотация:his paper considers the problem of influential users detection in online social networks. Identifying of such key entities is of interest in many areas: marketing, politics, information security, business. The degree of the node of the corresponding graph is used as a popularity indicator in this work. Network query limitation is the main challenge in discovering their structure. Therefore, our task is to detect a percentage of the highest degree network nodes under a budget restriction. We propose a three-step crawling algorithm in two versions to solve the problem. We experimentally show its efficiency at various budget limits and superiority over known crawling strategies. For example, to detect top-1% of hubs with 90% precision, one needs to crawl 5% of graph nodes in average with our 3-StepBatch algorithm. We also show that our algorithm performs well for different target set sizes, from 0.01% to 10% of the graph.