A social network is a social structure made of actors, which are discrete individual, corporate or collective social units like persons or departments  that are tied by one or more specific types of relation or interdependency, such as friendship, membership in the same organization, sending of messages, disease transmission, web links, airline routes, or trade relations. The actors of a social network can have other attributes, but the focus of the social network view is on the properties of the relational systems themselves . For many applications social networks are treated as graphs, with actors as nodes and ties as edges. A group is the finite set of actors the ties and properties of whom are to be observed and analyzed. In order to define a group it is necessary to specify the network boundaries and the sampling. Subgroups consist of any subset of actors and the (possible) ties between them.
The science of social networks utilizes methods from general network...
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