| 摘要 |
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for content presentation. In one aspect, a method includes receiving a request for an ad to be presented to a user; for a collection of ads, identifying one or more candidate ads including using image keywords derived from images associated with the user to identify the one or more candidate ads; selecting an ad responsive to the ad request from the candidate ads; and sending the selected ad for presentation to the user. |
