This map, Wikipedia pageviews, percentage to language X, shows the relative 'popularity' of any particular Wikipedia language version in different countries.
A second map, Pageviews per capita to any Wikipedia, focuses on in which countries an average person requests most Wikipedia articles, regardless of language.
(switch between maps with button top-left)
Info panels reveal details about the selected language (button 'Breakdown ..') or any country (hover over it).
Metrics include population size, percentage connected to internet, monthly views, etc.