15. The method of claim 13 , further comprising: classifying a document as a preliminary adult document if the corresponding document score exceeds a first threshold; classifying a document group as a preliminary adult group if the number of preliminary adult documents divided by a total number of documents in a document group exceeds a second threshold; classifying a candidate hub as an adult hub if the number of preliminary adult groups divided by a total number of document groups associated with the candidate hub exceeds a third threshold.
13. The method of claim 10 , each document group comprising documents associated with a single container.