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Humans interact through numerous channels to build and maintain socialconnections: they meet face-to-face, initiate phone calls or send textmessages, and interact via social media. Although it is known that the networkof physical contacts, for example, is distinct from the network arising fromcommunication events via phone calls and instant messages, the extent to whichthese networks differ is not clear. In fact, the network structure of thesechannels shows large structural variations. Each network of interactions,however, contains both central and peripheral individuals: central members arecharacterized by higher connectivity and can reach a high fraction of thenetwork within a low number of connections, contrary to the nodes on theperiphery. Here we show that the various channels account for diverserelationships between pairs of individuals and the corresponding interactionpatterns across channels differ to an extent that hinders the simple reductionof social ties to a single layer. Furthemore, the origin and purpose of eachnetwork also determine the role of their respective central members: highlyconnected individuals in the person-to-person networks interact with theirenvironment in a regular manner, while members central in the socialcommunication networks display irregular behavior with respect to theirphysical contacts and are more active through rare, social events. Theseresults suggest that due to the inherently different functions of communicationchannels, each one favors different social behaviors and different strategiesfor interacting with the environment. Our findings can facilitate theunderstanding of the varying roles and impact individuals have on thepopulation, which can further shed light on the prediction and prevention ofepidemic outbreaks, or information propagation.

Contact activity and dynamics of the online elite