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. 2019 Feb 20;9:2361. doi: 10.1038/s41598-019-39025-4

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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When friends replace relatives, local clustering falls, and the graph distances become shorter. In both panels, the x-axis is the average number of relatives an average individual has. (At the upper limit of 60, all the social contacts of the individuals are relatives). Panel (a) y-axis: the average local clustering coefficient, i.e., the average number of closed social triads around individuals. Panel (b) y-axis: the graph distance, i.e., the average length of shortest routes between nodes in the network. Blue: group size at 500. Red: group size at 2000. (Each colour on each panel represents 400 independently simulated repeats).