I use the public stream with a filter on location (:locations => '-180,-90,180,90') Twitter doesn't seem to have limitation for that. The backend is written in

I use the public stream with a filter on location (:locations => '-180,-90,180,90') Twitter doesn't seem to have limitation for that. The backend is written in Ruby. The daemon to index tweets use the great Intridea gem https://github.com/intridea/tweetstream https://github.com/intridea/tweetstream. The page http://onemilliontweetmap.com/ http://onemilliontweetmap.com/ is simple Sinatra application, and I use REDIS pub/sub to push tweets to the browser.