After thinking the idea out further, it's obvious that the people behind Twitter have a better idea on how to generate a nice full-featured app that shows the exact location of people using the micro-blog service.

TrendsMap (mentioned in the preceding post) uses the IP-related locations of users based on how they described their locales when signing up. As people know, that's not fully reliable and exact.

A recent Twitter developers' blog note, cited in
http://www.businessweek.com/technology/content/aug2009/tc20090823_834450.htm shows that Twitter will help others use an API that is specific to a device like an iPhone or a Blackberry.

With that tool exact maps of geolocation will become far more complete and exact. And ultimately, as common as maps are at most online information-directory sites.

The exact description at Twitter Blog:
http://blog.twitter.com/2009/08/location-location-location.html