1. One or more computer storage media having embodied thereon computer-usable instructions that, when executed, perform a method of entity linking, comprising: identifying mentions of entities within a document; identifying candidate entities associated with each mention; defining mention-entity pairs for each mention and the associated candidate entities; identifying a confidence score for each mention-entity pair; identifying relationships between the candidate entities; for each mention-entity pair, updating the confidence score based on the relationships between the associated candidate entity and the candidate entities associated with other mention-entity pairs; selecting candidate entities from the mention-entity pairs based on the updated confidence scores; and ranking the selected entities, wherein the ranking indicates a relevance of the selected entities to a topic of the document.