Abstract: In one embodiment, a system includes one or more computing systems that implement a social networking environment and are operable to access stored information including a plurality of nodes including a first set of user nodes that each correspond to a respective user and a second set of concept nodes that each correspond to a respective concept. The stored information further includes a plurality of edges that each define a connection between a corresponding pair of nodes including a first set and a second set of edges. Each edge from the first set defining a connection between a pair of user nodes and representing a social relationship between the users corresponding to the user nodes. Each edge from the second set defining a connection between a user node and a concept node and representing an interest of the user of the user node with respect to the corresponding concept node.