1. A user-interface method of providing to a first content system preferences learned from user interactions with at least one second content system, the method comprising: monitoring user interactions with the at least one second content system, the at least one second content system having a set of content items, each content item having at least one associated descriptive term to describe the content item; analyzing the descriptive terms associated with content items with which a user interacted to learn the user content preferences for the content of the at least one second content system and associating at least one of a user identifier and a device identifier with the learned preferences; and in response to a request from the first content system for content preferences associated with at least one of a specified user identifier and a specified device identifier, providing the learned preferences associated with a matching identifier.