System and methods for leveraging passive networks are disclosed. In one embodiment, a method includes receiving, from a first data source, a first data descriptor, wherein the first data descriptor identifies an instance of contact between at least two persons. The method also includes determining a connection between the at least two persons, wherein the connection is based on an instance of contact between the at least two persons identified in the first data descriptor. The method further includes determining, with a processor, a first contact count for the connection, the first contact count based on a number of instances of contact between the at least two persons associated with the connection. The method also includes calculating, with the processor, a connection score for the connection, wherein the connection score is based at least in part on the first contact count.