1. A method for supplementing a web graph of linked web documents, the method comprising: identifying an existing web graph of web documents wherein web documents associated with a given category are linked together in the existing web graph; identifying one or more experts for one of one or more categories; identifying one or more web documents tagged by the one or more experts for the given category; determining a corresponding category of the one or more web documents tagged by the one or more experts for the given category; assigning a proxy web document to each one of the one or more experts identified for the given category, the proxy web document representative of a corresponding one of the one or more experts; and linking the one or more web documents in the existing web graph corresponding to the given category to one or more proxy web documents and the one or more web documents tagged by the one or more experts for the given category.