17. The system of claim 13 wherein primary users are identified as experts of the one or more categories of web documents based on a number of secondary users that agree with the plurality of primary users tagging of web documents as falling within the one or more categories.
17. The system of claim 13 wherein primary users are identified as experts of the one or more categories of web documents based on a number of secondary users that agree with the plurality of primary users tagging of web documents as falling within the one or more categories. 18. The system of claim 17 , wherein the plurality of web document are tagged as falling within the one or more categories by a plurality of experts of the one or more categories.