Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for distributing content items. In one aspect, a method includes identifying a content item that is eligible to be provided in response to a content item request and is associated with a bid. It is determined that the identified content item includes two or more different interactive elements that each cause different actions to be initiated in response to user interaction with the different interactive elements. An auction score is determined for the content item based on a function of the bid, a bid modifier for each different interaction, and a probability that each interaction will be invoked. The content item is selected to be provided based on the auction score. Data that cause presentation of the selected content item at a user device are output.

Abstract: According to at least one aspect, a method for providing content items augmented with format elements includes receiving a request for a content item and generating a plurality of augmented content items based on a plurality of original content items and a plurality of format elements. In a first stage a first content item associated with a first original content item is selected based on normalized auction scores of the content items. In a second stage, a set of content items associated with the first original content item is identified. Selection scores for the content items in the identified set are computed based on respective normalization parameters. A second content item is selected from the identified set based on the selection scores and a bid amount. The second content item is then provided for display to a user.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for distributing content items. In one aspect, a method includes identifying a content item that is eligible to be provided in response to a content item request and is associated with a bid. It is determined that the identified content item includes two or more different interactive elements that each cause different actions to be initiated in response to user interaction with the different interactive elements. An auction score is determined for the content item based on a function of the bid, a bid modifier for each different interaction, and a probability that each interaction will be invoked. The content item is selected to be provided based on the auction score. Data that cause presentation of the selected content item at a user device are output.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for distributing content items. In one aspect, a method includes identifying a content item that is eligible to be provided in response to a content item request and is associated with a bid. It is determined that the identified content item includes two or more different interactive elements that each cause different actions to be initiated in response to user interaction with the different interactive elements. An auction score is determined for the content item based on a function of the bid, a bid modifier for each different interaction, and a probability that each interaction will be invoked. The content item is selected to be provided based on the auction score. Data that cause presentation of the selected content item at a user device are output.

Abstract: According to at least one aspect, a method for providing content items augmented with format elements includes receiving a request for a content item and generating a plurality of augmented content items based on a plurality of original content items and a plurality of format elements. In a first stage a first content item associated with a first original content item is selected based on normalized auction scores of the content items. In a second stage, a set of content items associated with the first original content item is identified. Selection scores for the content items in the identified set are computed based on respective normalization parameters. A second content item is selected from the identified set based on the selection scores and a bid amount. The second content item is then provided for display to a user.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for distributing content items. In one aspect, a method includes identifying a content item that is eligible to be provided in response to a content item request and is associated with a bid. It is determined that the identified content item includes two or more different interactive elements that each cause different actions to be initiated in response to user interaction with the different interactive elements. An auction score is determined for the content item based on a function of the bid, a bid modifier for each different interaction, and a probability that each interaction will be invoked. The content item is selected to be provided based on the auction score. Data that cause presentation of the selected content item at a user device are output.