A very nice visualization of the language communities of London, as revealed by Twitter:
English tweets (grey) dominate (unsurprisingly) and they provide crisp outlines to roads and train lines as people tweet on the move. Towards the north, more Turkish tweets (blue) appear, Arabic tweets (green) are most common around Edgware Road and there are pockets of Russian tweets (pink) in parts of central London. The geography of the French tweets (red) is perhaps most surprising as they appear to exist in high density pockets around the centre and don’t stand out in South Kensington (an area with the Institut Francais, a French High School and the French Embassy). It may be that as a proportion of tweeters in this area they are small so they don’t stand out, or it could be that there are prolific tweeters (or bots) in the highly concentrated areas.
And don’t miss Eric Fischer’s map (at the end of the post) similarly visualising the language communities of the entire world.