This map is an experiment inspired by discussions on the Baltimore Tech facebook page. It contains an estimated 2-4% of all twitter traffic, as only a small handful of tweets are geotagged (these are usually sent from mobile devices)
Here's a wordle word cloud created from all of the tweets on this map.
Vacants Data: OpenBaltimore
Income Data: American Community Survey 2010 1-year Estimates, U.S. Census