Social bookmarks are systems of social labeling of links that have been widely used in libraries and information services. However, there hasn't been a study of the information management model underlying social bookmarking tools, or technical capabilities necessary to meet the requirements of the model.This paper outlines a generic model based on the detection of features, and applies it on eight social bookmarking services. The results confirm that the performance of the services do not cover all features of the generic model, and the layer of social services is inadequate
