Abstract: The present disclosure provides new and innovative systems and methods for profiling bias for data sources, specifically publishers of news articles. A variety of embodiments include a computer-implemented method for profiling a data source includes obtaining an indication of a first data source, determining visitor and keyword data for the first data source, determining metadata for the first data source, generating a source similarity graph for the first data source, the source similarity graph indicating at least one similar data source and, for each similar data source, a bias score for the similar data source, classifying the first data source based on the bias scores for the at least one similar data source, generating a notification indicating the first data source and the classification of the first data source, and providing the notification.