Abstract: In general, in one aspect, a method includes compiling user interaction statistics for a set of content items displayed in association with a first target media document having a non-textual portion, at least some of the content items associated with one or more keywords, based on the interaction statistics, associating the first target media document with at least some of the keywords associated with the content items, and based on a common attribute of the first target media document and a second target media document having a non-textual portion, associating the second target media document with at least some of the keywords assigned to the first target media document. Other aspects include corresponding systems, apparatus, and computer programs stored on computer storage devices.

Abstract: In general, in one aspect, a method includes compiling user interaction statistics for a set of content items displayed in association with a first target media document having a non-textual portion, at least some of the content items associated with one or more keywords, based on the interaction statistics, associating the first target media document with at least some of the keywords associated with the content items, and based on a common attribute of the first target media document and a second target media document having a non-textual portion, associating the second target media document with at least some of the keywords assigned to the first target media document. Other aspects include corresponding systems, apparatus, and computer programs stored on computer storage devices.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer-readable storage medium, for tracking activities following a view of a sponsored video content item. A method includes: determining that a user has been presented a sponsored video content item; tracking specific activities after the presentation including identifying activities of the user in a channel associated with the sponsored video content item in a specified time period and attributing the specific activities to the presentation of the sponsored video content item; and surfacing the specific activities to a sponsor of the sponsored video content item.

Abstract: In general, in one aspect, a method includes compiling user interaction statistics for a set of content items displayed in association with a first target media document having a non-textual portion, at least some of the content items associated with one or more keywords, based on the interaction statistics, associating the first target media document with at least some of the keywords associated with the content items, and based on a common attribute of the first target media document and a second target media document having a non-textual portion, associating the second target media document with at least some of the keywords assigned to the first target media document. Other aspects include corresponding systems, apparatus, and computer programs stored on computer storage devices.

Abstract: In one implementation, a computer-implemented method includes receiving a request from a client computing device for an electronic video, and dynamically identifying content to display while the video is played based on one or more content parameters associated with the video that indicate, at least, a type of dynamic content to be identified after the request is received. The method can further include providing the identified dynamic content to the client computing device in a form so that the dynamic content will be displayed on the client computing device in accordance with one or more display parameters that indicate, at least, a time during playback of the video or a location in relation to the video at which the dynamic content is displayed.