• The time slider will start in play mode. Press the pause or play button to stop and start it or grab the handle and drag it.
• Use the buttons in the top left to zoom or move around the map. You can also just drag the map with your mouse.
• Use the 'US' or 'World' buttons to show the corresponding region.
• Use your mouse wheel to zoom as well.
• Hover over a circle to see the twitter message.
• Enter text in either of the 2 colored boxes at the bottom left to filter the messages. The circles are colored based on which text they match. If they match both then they are colored white.

• Casey Reas, Ben Fry, and the community around the wonderful tool Processing
• Tom Carden of Stamen Design and others for the creation of Modest Maps, especially the Processing version
• Twitter and all the users that create such interesting data
• Dave Troy for the Twittervision API and Yahoo for their Geocoding API
• Microsoft Live Search Maps for the map images
• Nathan from FlowingData who created a similar tool in Flash

This application depends on Java and may take a little while to start up. There is a video and a few more details available on the weblog post.