2. The method of claim 1 , wherein a document in the set of documents includes an annotation to indicate whether the document is related to the specific topic.
2. The method of claim 1 , wherein a document in the set of documents includes an annotation to indicate whether the document is related to the specific topic. 3. The method of claim 2 , wherein an annotation in a given document indicates whether the given document: is related to the specific topic; is a spam document; or is not related to the specific topic or is off-topic.