Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for receiving a query, receiving a set of social search results including one or more social media items that have been distributed through one or more computer-implemented services, each social media item being responsive to the query, providing a sub-set of social search results based on respective promotion scores provided in an auction, the sub-set of social search results including at least one social media item of the set of social search results, and providing the sub-set of social search results for display in a search results page, social media items of the sub-set of social search results being displayed based on respective promotion scores.