Systems, methods and apparatus, including computer program products, to provide posts to discussion threads in response to a search query. The methods include receiving information identifying multiple resources that have been identified by a search engine as satisfying a search query, identifying a first resource in the multiple resources as including a post to a discussion forum, and identifying one or more second resources that are each distinct from the first resource. Each second resource is linked directly or indirectly to the first resource and includes one or more other posts to the discussion forum. Further, the method includes extracting information from the first resource and the one or more second resources about the discussion forum, and providing the extracted information together with a link to the first resource to a user device for display to a user as part of a response to the search query.