USGS pipes Twitter into location/time/magnitude of earthquakes
8 months, 3 weeks agoYahoo Pipes has a collection of Twitter pipes available, and could definitely be used to process real-time, geo-coded data from Twitter, Flickr, et al. to give a snapshot of a location.

[...] this technology to build a rich, near-realtime map of a city has not gone unnoticed. While the the USGS is uses Twitter to determine the magnitude of earthquakes, advertising agencies are developing data mashups to track trends at postcode level. Twitter is [...]