9. The non-transitory computer readable medium of claim 8 , wherein identifying the subset of the received plurality of documents comprises: determining a score for each document representing a measure of suitability for training the content classifier with respect to the category; and identifying one or more documents having a determined score exceeding a specified suitability threshold.
9. The non-transitory computer readable medium of claim 8 , wherein identifying the subset of the received plurality of documents comprises: determining a score for each document representing a measure of suitability for training the content classifier with respect to the category; and identifying one or more documents having a determined score exceeding a specified suitability threshold. 10. The non-transitory computer readable medium of claim 9 , wherein the operation further comprises: receiving user feedback for at least one of the received plurality of documents, wherein the subset of the received plurality of documents is identified based on the received user feedback.