36. The non-transitory computer-readable storage medium of claim 34 , where the set of instructions to generate the score for the document includes: a set of instructions to generate the score for the document based on whether there is an increase or a decrease in a rate of change in the content of the document.
34. A non-transitory computer-readable storage medium comprising sets of instructions executable by one or more processors, the sets of instructions comprising: a set of instructions to determine a measure of how a content of a document changes over time, as a function of: an update frequency based on a number of updates of the content of the document over time, and an update amount based on: how much visible content of the document, out of a total amount of visible content of the document, has changed over time, and at least one of: a quantity of new pages added to the document over time, or a ratio of a quantity of new pages associated with the document over time versus a total quantity of pages associated with the document; a set of instructions to generate a score for the document based on the measure of how the content of the document changes over time; and a set of instructions to rank the document with regard to at least one other document based on the score.