15. The non-transitory computer-readable media of claim 13 , where the one or more instructions to cause the processing logic to identify, as the set of second documents, second documents that include, or previously included, links to the first document include: one or more instructions to determine a first number of second documents, of the set of second documents, that include the link to the first document; and one or more instructions to determine a second number of second documents, of the set of second documents, that previously included the link to the first document.
15. The non-transitory computer-readable media of claim 13 , where the one or more instructions to cause the processing logic to identify, as the set of second documents, second documents that include, or previously included, links to the first document include: one or more instructions to determine a first number of second documents, of the set of second documents, that include the link to the first document; and one or more instructions to determine a second number of second documents, of the set of second documents, that previously included the link to the first document. 16. The non-transitory computer-readable media of claim 15 , where the one or more instructions to cause the processing logic to assign the freshness score to the first document include: one or more instructions to assign a first freshness score to the first document when the first number is smaller than the second number; and one or more instructions to assign a second freshness score to the first document when the first number is larger than the second number, where the first freshness score is lower than the second freshness score.