19. A system for determining a particular document that initiated a topic of interest in a collection of documents, each of the documents having contents and a time it was created, comprising: a time ranking module that ranks the documents in the collection based on the respective times that the documents were created; a content ranking module that ranks the documents based on how similar their respective contents are to the topic of interest; an originality ranking module that ranks the documents based on originality of their respective contents; a forum ranking module that ranks the documents based on an identification and name of a forum that each document originated from; a composite ranking module that ranks the documents based on the time, the contents, the originality rankings, and the forum; and a determination module that determines the particular document that initiated the topic of interest from the composite ranking.
23. The system of claim 19 , further comprising: a link ranking module that ranks the documents based on the number of hyperlinks in each one of the documents.