API Cartographer Eric Fischer plots language shapefiles of Twitter.
Some other images show how social media cuts across place, time and culture and communications have 'defeated' geography to unite the world. This image (besides looking pretty) shows that culture and place still matter within our increasingly interconnected globalized communications. There are some very real creating obstacles to diffusion and even if the technology exists for "one huge conversation," there are non-intersecting conversations because of cultural and community differences.
Via Andrew Shears, PhD