I am not sure if you are talking about the same but this may be the source[1]. Also the blog discusses about the relation between device usage to the degree of

I am not sure if you are talking about the same but this may be the source[1]. Also the blog discusses about the relation between device usage to the degree of affluent neighbourhood[2]. [1]. https://www.mapbox.com/labs/twitter-gnip/brands/#5/36.280/-229.746 https://www.mapbox.com/labs/twitter-gnip/brands/#5/36.280/-2... [2]. https://www.mapbox.com/blog/visualizing-3-billion-tweets/ https://www.mapbox.com/blog/visualizing-3-billion-tweets/