1. A method of determining interaction analytics for user interactions with a catalog of audio/video content items, the method comprising: providing a predefined collection of content identifiers for identifying content items based on characteristics of said content items; providing access to a catalog of content items, a plurality of the content items of the catalog being associated with metacontent describing a corresponding content item; analyzing the metacontent associated with at least one of the plurality of content items of the catalog and associating at least one content identifier with said at least one content item based on the metacontent associated with said at least one content item; monitoring user interactions with the content items of the catalog and forming historical records of said interactions, the historical records including at least one content identifier associated with the content items with which the user interacted; and determining interaction analytics for at least one of a set of content items of the catalog and a set of users having interacted with the content items of the catalog based on the historical records of user interactions and based on at least one specified content identifier.