1. A method implemented by data processing apparatus, the method comprising: receiving an answer to a question wherein the question was submitted by a user to a system, and wherein the answer was submitted to the system by an answerer that is a member of a social network of the user in response to the question; identifying an entity in content of the answer, in which the entity refers to a product, a service, a company, or a merchant; requesting permission from the answerer to provide an interactive link with the answer wherein the interactive link is a link to a resource for the entity that is configured to cause presentation of the resource when selected; after requesting permission, receiving input from the answerer granting permission to provide the interactive link with the answer; after receiving input from the answerer granting permission: receiving a user submitted query and determining that the query is related to the entity; and responsive to receiving the user submitted query, providing the answer, including the interactive link to the resource, as a search result of a plurality of search results that are responsive to the query.