5. The method according to claim 1 , further comprising computing a set of similar documents or tags or both tags and documents using the tag profile or document profile associated with the selected tag or document.
5. The method according to claim 1 , further comprising computing a set of similar documents or tags or both tags and documents using the tag profile or document profile associated with the selected tag or document. 6. The method according to claim 5 , wherein said computing is performed when the selected document does not appear in the bigraph by substituting therefor a document used to construct the bigraph having a comparable similarity measure.