17. A system comprising: one or more server devices to: identify, as a set of second documents, second documents that include, or previously included, links to a first document; determine times at which the links to the first document were created; assign a freshness score to the first document based on the times at which the links to the first document were created; and rank the first document, with respect to at least one other document, based on the freshness score assigned to the first document.
17. A system comprising: one or more server devices to: identify, as a set of second documents, second documents that include, or previously included, links to a first document; determine times at which the links to the first document were created; assign a freshness score to the first document based on the times at which the links to the first document were created; and rank the first document, with respect to at least one other document, based on the freshness score assigned to the first document. 18. The system of claim 17 , where, when identifying, as the set of second documents, second documents that include, or previously included, links to the first document, the one or more server devices are further to: determine a first number of second documents, of the set of second documents, that include the link to the first document; and determine a second number of second documents, of the set of second documents, that previously included the link to the first document.