The term 'Natural Cities' refer  to: ''spatially clustered geographic events, such as the agglomerated patches aggregated from individual social media users’ locations.'' (Jiang & Miao, 2015). To derive natural cities in the USA we used data from the former location based social media Brightkite. These individual check-in points were converted in a Triangulated Irregular Network (TIN). The smaller than average triangles were categorized as natural cities. The result is a map of the natural cities in the United stated in 2008 (figure 12). Next to this map, an animation of the development of Natural Cities in the USA is added to this page (figure 13).