11. The method of claim 10 , further comprising: analyzing the document to identify one or more of: a date of publication of the document, information related to a cluster of documents with which the document is associated, or a measure of freshness of the document, and where calculating the score includes calculating the score further based on the one or more of the date of publication of the document, the information related to the cluster of documents with which the document is associated, or the measure of freshness of the document.
13. The method of claim 11 , where the information related to the cluster of documents includes information identifying a quantity of countries associated with sources associated with documents within the cluster.