Data Introduction
This is a look at tweets. There is 2229289 coordinates in the map. After removing the duplicated data, there is 539657 coordinates.
Based on the tool datamaps, the precision is 6 digits of decimal places.
No. Coordinates Files
1 twitter042.txt

I am trying to use twitter friendship coordinates of 550000 paires to plot a map, it is inspired by Facebook Friendship Visualization by Paul Bulter

Press here to open high resolution file: High Res

I am using R language to plot a world map. There is 2229289 coordinates in the map. I generate a color from black to purple to white based on the coordinate intensity.

This figure is to polt Toronto map based on 3000 coordinates. The color is form black to blue to white,the white point displayed is multipoints to be merged.