28. The non-transitory computer readable storage medium of claim 27 , wherein prior to conditionally confirming the authorship of the first document by the entity associated with the second document, the at least one program includes instructions to: identify a first link in the first document that links to the second document, wherein the first link includes the first predefined authorship attribute; access the second document; and determine that the second document includes the second link including the second predefined authorship attribute.
28. The non-transitory computer readable storage medium of claim 27 , wherein prior to conditionally confirming the authorship of the first document by the entity associated with the second document, the at least one program includes instructions to: identify a first link in the first document that links to the second document, wherein the first link includes the first predefined authorship attribute; access the second document; and determine that the second document includes the second link including the second predefined authorship attribute. 29. The non-transitory computer readable storage medium of claim 28 , wherein prior to conditionally confirming the authorship of the first document by the entity associated with the second document, the at least one program includes instructions to, starting with the first document, traverse links in the chain of links until the second document that includes the second link including the second predefined authorship attribute is identified.