A question graph is considered a semantic approach that intends to manage asking and answering questions in a logical format. The questions and answers are related to each other in meaningful ways through entities. A method performed by one or multiple computers may generate a question graph that comprises of a respective node for each of a plurality of questions; connecting entities, with links in the question graph. These are typically nodes for questions that are equivalent or comprising of trusted sources on each of the plurality of questions based on user selections of search results. They are derived partly in response to previous submissions of the question as a search query to a search engine. Deciphering pairs of questions from the plurality of questions when the questions occur in each identified pair of questions if they have at least a first threshold number of commonly identified selected resources. To populate PAA and related questions, search engines select one or more questions cataloged results and transmit data identifying the selected questions to the user device as part of a response to the new search query.