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In one embodiment, a method includes maintaining access to information comprising nodes and edges; receiving a request from a first user corresponding to a first user node for a structured document corresponding to a first concept node: determining a first data set that identifies concept nodes con nected by edges with user nodes that are each connected by edges with both the first user node and the first concept node: determining a second data set that identifies concept nodes connected by edges with the first concept node and user nodes that are each connected to the first user node; generating a score for each concept node in the data sets; selecting one or more concept nodes based on their scores as recommended nodes; and transmitting to the client device the structured document and code executable by a client application to render node names or identifiers of the recommended nodes for display.