1. A method performed by one or more server devices, the method comprising: identifying, by the one or more server devices, a source that published a document, the source corresponding to an entity that publishes documents; determining, by the one or more server devices, a measure of importance of the source that published the document, determining the measure of importance of the source including: determining that content of the document includes information that is associated with a geographic region, and determining whether the source is associated with a geographic region that matches the geographic region associated with the information included in the content of the document, the measure of importance of the source being determined based on determining whether the source is associated with a geographic region that matches the geographic region associated with the information included in the content of the document, the measure of importance of the source exceeding measure of importance of one or more different sources that publish documents when: the source is associated with a geographic region that matches the geographic region associated with the information included in the content of the document, and the one or more different sources are associated with a geographic region that does not match the geographic region associated with the information included in the content of the document; and ranking, by the one or more server devices, the document against at least one other document, based on one or more factors, the one or more factors including the determined measure of importance of the source, the at least one other document being published by another source.