Figure 1

Comparison of link sets in the three networks. (a) Venn diagrams showing the number of links in the different channels: ambient (left), intimate (right). Color code is given on the right. (b) Correlation of link weight between the channels in log-log scale. Weight is defined by the number of contacts taking place on the links, normalized by the maximum observed value. (c) Fraction of social links recovered by the strongest ambient (dashed) and intimate (solid) physical proximity links: calls (green) and Facebook (blue). Inset shows the coverage of call links by Facebook interactions.