A solution that goes by a very suitable name, Nearby Tweets is still being put together by the programmer yet you can already try it out and see how it fares for yourself. As you can see by the review’s title, it is a search tool for looking up twitterers within any given range.
This search process includes one refinement label that lets you set down specific keywords in the tweets themselves. This is a nice and necessary feature, otherwise the results would take you ages to sift through. Perhaps they could also include a functionality for excluding tweets with certain words in them in future updates.
Note that Mr. Brian Cray (the person responsible for the project) is looking not only for feedback but also for those who can make a contribution to the project itself, such as designers willing to volunteer their skills. If you are a bit of a Twitter fan, find this service compelling, and wish to see it further developed, do make a point of contacting him through any of the provided channels.
NearbyTweets.com In Their Own Words
“Instantly find Twitterers nearby (or anywhere for that matter).”
Why NearbyTweets.com It Might Be A Killer
It is an interesting Twitter tool that even at this formative stage shows some promise.
Some Questions About NearbyTweets.com
Are territories the world over accounted for? 
