One or more implementations of the present specification provide a social content risk identification method. Social content data to be identified is obtained. Features of the social content data are extracted, including a plurality of features of at least one of social behavior records or social message records in the social content data. The features are expanded by generating dimension-extended features using a tree structured machine learning model. The social content data is classified as risky social content data by processing the dimension-extended features using a deep machine learning model.