Fig 4. Fraction of active dyads in the different networks.

Curves show the ratio between existing and potential links between participants in each network. All students attend classes at the same campus and eat at the same cafeterias, so their proximity network is very dense (with 40% of dyads active). Only about 2-3% of them actually connect as friends on Facebook, and less 1% communicate using calls, text messages, or Facebook interactions. Each network is unweighted and aggregated over a month—a link exists between two nodes if they had any interactions in a given channel during that month.