Where do the people of r/programming live?

The respondents of the 2011 r/programming study mainly come from English speaking countries, followed by the rest of Europe and India. The heat map below is calculated using a 15-pixel size grid and the number of clicks within each grid is then represented using color that ranges from none-blue-green-yellow-red. Red indicates the highest concentration of respondents. The white dots indicate individual clicks on the map.

Location and individual clicks using a 15-pixel grid

By reducing the grid size, more detailed results can be shown. Whereas the East Coast of the U.S. appeared to be of about equal in size as Silicon Valley above, the figure below illustrate that respondents from Silicon valley are more concentrated.

Location using a 10-pixel grid

For comparison, the figure below shows an even higher level of detail using 5 pixels as the grid size. 

Location using a 5-pixel grid