I had been wanting to make this for a while before finding out on Saturday that Mike McCandless had extracted Chrome's open-source language detector into a standalone library, which suddenly made it much more practical.
There are a lot of near-identical colors for different languages because I was optimizing for maximum distinguishability of languages used near each other rather than for global uniqueness. The exception is English, which is in gray because it is so common almost everywhere that it threw off the process of choosing the other colors.
Nathan pointed out an error in the language labels. Fixed now.
Data from the Twitter streaming API, May 14-October 20, 2011.
sbouboux, Bruno Boutot, Blau Zahl, chwarnow, and 176 other people added this photo to their favorites.

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Yaponeshia 17 months ago | reply
Great map !!!
what is the data source exactly ? only one day twitter use last october ? another period ? thanks for the info !
Eric Fischer 17 months ago | reply
As the description says, it is from over the course of months, May 14-October 20, 2011.
Miquelmiquel 17 months ago | reply
Eric,
Any chance of homing in on multiethnic countries like Switzerland, Belgium, Finland, Canada or Spain? I'm particularly interested in a better rendering (=less blurred!) of the Catalan-speaking areas, as reproduced here:
miquelstrubell.blogspot.com/2011/11/mapa-linguistic-de-le...
amareas 16 months ago | reply
Make Polish or german other color.
travisjthompson 16 months ago | reply
We're showing a lot of your pics and talking about you.
www.openequalfree.org/nerd-alert-mapping-the-twitter-lang...
Thanks for the great work!
thebedbugsgeek 7 months ago | reply
Loved the neon color selection, really made the locations pop.
Mike.
vinjohn1 7 months ago | reply
this is cool.
kenyclark 7 months ago | reply
Interesting.
joshfullr 7 months ago | reply
interesting data.
ruth48441 7 months ago | reply
surprising. great work guys.
andreaespinosa 6 months ago | reply
thanks for sharing.
kenlopez 6 months ago | reply
surprising.
mszavala 5 months ago | reply
this is cool.
amandawilliamson1 4 months ago | reply
The neon colors are the best.
verauniversity 4 months ago | reply
Nice colors. I love it.
andrewkraus 3 months ago | reply
so cool. Great work.
cathyrice23 3 months ago | reply
I like the neon colors.
bonniesanders 3 months ago | reply
Wow. I want to learn this too.
joshuacrow 3 months ago | reply
I find this cool.
simon ralli 3 months ago | reply
Hi Eric - have you written an articles about this map? Amazing work.