And I doubt most people realise; Twitters tweet location * Coordinates when tweet was posted from mobile device [side note: is this feature 'enabled' by defau

And I doubt most people realise; Twitters tweet location * Coordinates when tweet was posted from mobile device [side note: is this feature 'enabled' by default on some mobile clients?] * Place (geographical name) derived from users ip when posting on twitter's web interface. Place gets translated into coordinates using geonames.com * Bounding Box derived from users ip when posting on twitter's web interface. The less accurate source, a corner of the bounding box is selected randomly.