%0 Journal Article %1 citeulike:9569504 %A Calabrese, Francesco %A Smoreda, Zbigniew %A Blondel, Vincent D. %A Ratti, Carlo %D 2011 %I Public Library of Science %J PLoS ONE %K citeulike data, mobile, networks, phone, relations, sna, social, telecommunications %N 7 %P e20814+ %R 10.1371/journal.pone.0020814 %T Interplay between Telecommunications and Face-to-Face Interactions: A Study Using Mobile Phone Data %U http://dx.doi.org/10.1371/journal.pone.0020814 %V 6 %X In this study we analyze one year of anonymized telecommunications data for over one million customers from a large European cellphone operator, and we investigate the relationship between people's calls and their physical location. We discover that more than 90\% of users who have called each other have also shared the same space (cell tower), even if they live far apart. Moreover, we find that close to 70\% of users who call each other frequently (at least once per month on average) have shared the same space at the same time - an instance that we call co-location. Co-locations appear indicative of coordination calls, which occur just before face-to-face meetings. Their number is highly predictable based on the amount of calls between two users and the distance between their home locations - suggesting a new way to quantify the interplay between telecommunications and face-to-face interactions.

@article{citeulike:9569504, abstract = {{In this study we analyze one year of anonymized telecommunications data for over one million customers from a large European cellphone operator, and we investigate the relationship between people's calls and their physical location. We discover that more than 90\% of users who have called each other have also shared the same space (cell tower), even if they live far apart. Moreover, we find that close to 70\% of users who call each other frequently (at least once per month on average) have shared the same space at the same time - an instance that we call co-location. Co-locations appear indicative of coordination calls, which occur just before face-to-face meetings. Their number is highly predictable based on the amount of calls between two users and the distance between their home locations - suggesting a new way to quantify the interplay between telecommunications and face-to-face interactions.}}, added-at = {2017-09-08T10:52:59.000+0200}, author = {Calabrese, Francesco and Smoreda, Zbigniew and Blondel, Vincent D. and Ratti, Carlo}, biburl = {https://www.bibsonomy.org/bibtex/246bf47479fd890feb43ad954ed1b9f05/fernand0}, citeulike-article-id = {9569504}, citeulike-linkout-0 = {http://dx.doi.org/10.1371/journal.pone.0020814}, day = 13, doi = {10.1371/journal.pone.0020814}, interhash = {fa078b28edfd459bf99c95d88d5d12fc}, intrahash = {46bf47479fd890feb43ad954ed1b9f05}, journal = {PLoS ONE}, keywords = {citeulike data, mobile, networks, phone, relations, sna, social, telecommunications}, month = jul, number = 7, pages = {e20814+}, posted-at = {2011-07-22 10:45:41}, priority = {2}, publisher = {Public Library of Science}, timestamp = {2017-09-08T10:53:23.000+0200}, title = {{Interplay between Telecommunications and Face-to-Face Interactions: A Study Using Mobile Phone Data}}, url = {http://dx.doi.org/10.1371/journal.pone.0020814}, volume = 6, year = 2011 }