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Given their importance in shaping social networks and determining howinformation or diseases propagate in a population, human interactions are thesubject of many data collection efforts. To this aim, different methods arecommonly used, from diaries and surveys to wearable sensors. These methods showadvantages and limitations but are rarely compared in a given setting. Assurveys targeting friendship relations might suffer less from memory biasesthan contact diaries, it is also interesting to explore how daily contactpatterns compare with friendship relations and with online social links. Herewe make progresses in these directions by leveraging data from a French highschool: face-to-face contacts measured by two concurrent methods, sensors anddiaries; self-reported friendship surveys; Facebook links. We compare the datasets and find that most short contacts are not reported in diaries while longcontacts have larger reporting probability, with a general tendency tooverestimate durations. Measured contacts corresponding to reported friendshipcan have durations of any length but all long contacts correspond to reportedfriendships. Online links not associated to reported friendships correspond toshort face-to-face contacts, highlighting the different nature of reportedfriendships and online links. Diaries and surveys suffer from a low samplingrate, showing the higher acceptability of sensor-based platform. Despite thebiases, we found that the overall structure of the contact network, i.e., themixing patterns between classes, is correctly captured by both self-reportedcontacts and friendships networks. Overall, diaries and surveys tend to yield acorrect picture of the structural organization of the contact network, albeitwith much less links, and give access to a sort of backbone of the contactnetwork corresponding to the strongest links in terms of cumulative durations.

Contact patterns in a high school: a comparison between data collected using wearable sensors, contact diaries and friendship surveys