Personalized Aggregation of Annotations

A server system receives an annotation of a respective entity by an author. The respective entity has an entity identifier, and the annotation has a scope that identifies a range of access to the annotation. The system identifies one or more database entries in a database. A respective database entry includes a first value and a second value. Each database entry corresponds to a respective index key comprising an entity-scope combination. The entity-scope combination corresponds to a respective entity and a respective scope. The system updates the first value in each of the one or more identified entries, without updating the second value in each of the one or more identified entries. The system receives a request for one or more annotations, and sends information corresponding to an annotation value in response to the request.