It is a pretty cool idea for a map but this map lies, misleads or at best has huge limitations! The data used to create the map are derived only from those who have an alexa toolbar thinggy on their browser (
http://www.alexa.com/site/download), there are no metadata, the algorith is not clear, the legend shows only one social networks in each country and these represent only traffic by those social networks and not the number of members which again is only traffic filtered through alexa. Presumably, the social networks associated with each country are those with the highest alexa use rank for those particular social networks that rank the highest. The map includes no ranks, numbers, story, etc. It is but a picture with lots of colours that happens to be organized into the shape of the world.
see -
How to Lie with Maps, by Mark Monmonnier -
http://www.mcwetboy.net/maproom/2006/05/review_how_to_l.php--
Tracey P. Lauriault
613-234-2805
https://gcrc.carleton.ca/confluence/display/GCRCWEB/Lauriault
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