1. A method comprising: accessing interaction data describing one or more interactions between at least one actor of a plurality of actors of an online social network service and one or more content items accessible on the online social network service; identifying, based on the interaction data, a specific content item posted by a particular actor of the plurality of actors and one or more interactions by respective other actors of the plurality of actors with the specific content item; calculating, by a machine including a memory and at least one processor and based on the interaction data, a leadership score associated with the particular actor, the leadership score indicating a propensity of the particular actor to spread information among the plurality of actors of the online social network service; determining a number of actors from the plurality of actors have each disseminated the specific content item within a predetermined time period after the specific content item was uploaded to the online social network service by the particular actor, the number of actors being within a predetermined number range; and classifying, based at least in part on the calculated leadership score, the particular actor as an information propagator among the plurality of actors of the online social network service.
1. A method comprising: accessing interaction data describing one or more interactions between at least one actor of a plurality of actors of an online social network service and one or more content items accessible on the online social network service; identifying, based on the interaction data, a specific content item posted by a particular actor of the plurality of actors and one or more interactions by respective other actors of the plurality of actors with the specific content item; calculating, by a machine including a memory and at least one processor and based on the interaction data, a leadership score associated with the particular actor, the leadership score indicating a propensity of the particular actor to spread information among the plurality of actors of the online social network service; determining a number of actors from the plurality of actors have each disseminated the specific content item within a predetermined time period after the specific content item was uploaded to the online social network service by the particular actor, the number of actors being within a predetermined number range; and classifying, based at least in part on the calculated leadership score, the particular actor as an information propagator among the plurality of actors of the online social network service. 8. The method of claim 1 , further comprising: accessing an electronic sociograph depicting each actor of the plurality of actors of the online social network service as a respective node in the electronic sociograph, the electronic sociograph including at least one edge extending between a respective node pair, wherein an edge represents a relationship between respective actors that correspond with a given node pair; and annotating a node in the electronic sociograph that corresponds to the particular actor with information indicating that the particular actor is classified as the information propagator.