A relationship between people’s mobility and their social networks is presented based on an analysis of calling and mobility traces for one year of anonymized call detail records of over one million mobile phone users in Portugal. We find that about 80% of places visited are within just 20km of their nearest (geographical) social ties’ locations. This figure rises to 90% at a ‘geo-social radius’ of 45km. In terms of their travel scope, people are geographically closer to their weak ties than strong ties. Specifically, they are 15% more likely to be at some distance away from their weak ties than strong ties. The likelihood of being at some distance from social ties increases with the population density, and the rates of increase are higher for shorter geo-social radii. In addition, we find that area population density is indicative of geo-social radius where denser areas imply shorter radii. For example, in urban areas such as Lisbon and Porto, the geo-social radius is approximately 7km and this increases to approximately 15km for less densely populated areas such as Parades and Santa Maria da Feira.
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机译：根据对葡萄牙超过一百万移动电话用户的匿名呼叫详细记录的一年的呼叫和移动轨迹的分析，得出了人们的移动性与其社交网络之间的关系。我们发现，大约80％的访问地点位于距离他们最近的（地理）社会联系地点仅20 公里之内。在“地理社会半径”为45 km的情况下，该数字上升到90％。就旅行范围而言，人们在地理上比牢固的关系更接近于脆弱的关系。具体来说，与强势关系相比，与弱势关系相距较远的可能性要高15％。与社会纽带有一定距离的可能性随着人口密度的增加而增加，而地缘社会半径越短，增长率越高。此外，我们发现区域人口密度指示了地缘社会半径，其中较密集的区域意味着半径较短。例如，在里斯本和波尔图等城市地区，地缘社会半径约为7 km，而对于人口稀少的地区（如Parades），该范围增加到约15 km还有圣玛丽亚·达·费拉（Santa Maria da Feira）。
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