Tip:
There is also a video (
Watch Screencast) on the twitterfall.com site on the right side of the screen. In the video they mention that you can use the GeoLocation and type in a city. They also stated that there was not a way to watch more than one location, or 2 cities. But...
Messing around with it I tried Florida in the location and it seemed to work. Then I tried United States. That also seemed to work. This could be good for targeting states or countrys depending on your market.
Hope this helps some of you out.
Doc