Abstract: A method of querying a user profile commences with a first access to a public portion of a knowledge profile for each of a plurality of potential targets of the electronic document, the public portion of each knowledge profile including public knowledge terms indicative of a knowledge base of a potential target of the electronic document. The first access is responsive to a first query received from an originator. A first matching operation is performed between a document term within the electronic document and public knowledge terms within the public portion of each knowledge profile to identify a first set of targets for which a match exists between the document term and at least one public knowledge term. The first set of targets is published to the originator.