13. The non-transitory computer-readable storage medium of claim 9 , wherein the perceived popularity of the first content item and the perceived popularity of the second content item are calculated by: determining popularity search results for the popularity queries for the first and second content items by crawling the Internet for digital instances that include information that satisfy the popularity queries.
13. The non-transitory computer-readable storage medium of claim 9 , wherein the perceived popularity of the first content item and the perceived popularity of the second content item are calculated by: determining popularity search results for the popularity queries for the first and second content items by crawling the Internet for digital instances that include information that satisfy the popularity queries. 14. The non-transitory computer-readable storage medium of claim 13 , wherein: the perceived popularity of the first content item is calculated based on a number of popularity search results determined for the popularity query for the first content item; and the perceived popularity of the second content item is calculated based on a number of popularity search results determined for the popularity query for the second content item.