These 2 maps show the ratio and total number of registered Linux users per country from the Linux Counter project as of March 3, 2014. You can select the displayed map from the dropdown menu on top right. You can see the values of the individual countries in the tooltip when moving the mouse over a country.
For the color scale on the ratio map, only countries with at least 1 million inhabitants were considered, otherwise small nations, especially Pitcairn, would cause a map were basically every visible country with data would appear in a pale blue. This is because Pitcairn is an extreme outlier with 3 of a mere 50 inhabitants registered as Linux users.
Apart from this D3.js based version, both maps are also available as image files:
Suriname has a conspicuously high ratio of Linux users. Linux Counter actually allows to get more detailed statistics for individual countries, in case of Suriname this looks certainly suspicious. There are just 7 users, whose names sound more Slavic than Dutch or Surinamese, and one of them has registered 1030 machines.
The data for other high ratio countries like Finland or Norway looks more sane. A more reliable map could probably be created based on the detailed data, omitting extreme outliers, i. e. users who registered many machines.