I have been paying around with the R package twitteR. It is an R interface to the Twitter web API. I used it to search for the 1000 latest tweets containing $TSLA (Tesla's stock ticker). I then removed tweets from outside North America, geolocated them, and plotted them on a map. The map is below.
As we would expect, most tweets are from urban areas -- particularly from Washington D.C to Boston, Florida, and California. Surprisingly there is only one tweet from Seattle, but quite a few from Atlanta. Also, there are many more tweets from the southern states compared to the upper midwest.
When I get a chance (hopefully soon), I'll post the code/packages I used to create the map.