1. A computer-implemented method of processing a request for a document that is unavailable on a network comprising: processing a request for a previously accessed document from a corresponding link by: sending the request to a location on the network of a source storing the previously accessed document; receiving a response from the source including one of: an error message, and content accessed by the source based on the request; analyzing the response and determining that the previously accessed document is unavailable on the network when one of: the response includes the error message, and the response includes the accessed content and a number of different words between the accessed content and stored content of the previously accessed document from a prior access exceeds a predetermined value; and in response to the previously accessed document being unavailable on the network, generating a query and identifying a plurality of alternative documents on the network with content pertaining to content of the previously accessed document and relating to a network group of users, wherein the network group of users is associated with a subject matter, and wherein the query includes first keywords from metadata associated with the previously accessed document and second keywords pertaining to one or more interests of the network group of users in the subject matter; presenting the identified alternative documents as a result of the request for the previously accessed document when the analyzing indicates that the previously accessed document is unavailable on the network; and replacing the corresponding link, when the previously accessed document is unavailable on the network, with a link to a presented alternative document based on a degree of confidence in the presented alternative document determined from a quantity of user selections for the presented alternative document, wherein the presented alternative document is a most frequently selected alternative document of the identified alternative documents.
3. The computer-implemented method of claim 1 , wherein the previously accessed document resides on a list indicating prior accessed documents and invoking requests for those prior accessed documents.