Embodiments relate to methods and systems for building representations of related subjects. User instructions may be received via a computer system that relate identifying information relating to a subject (e.g., an individual, group and/or event) to a node being associated therewith. Nodes in different accounts may be compared and matched based on identifying information associated with the nodes. Characteristics of one of the matched nodes may be added or modified based on characteristics of another of the matched nodes. A user may be notified of a potential match, a match, and/or node characteristics additions and/or modifications.