This web page from the research group Floatingsheep reports on their study mapping racist tweets following President Obama's re-election in 2012. Utilizing the geospatial tool DOLLY, the researchers collected and analyzed geocoded tweets using racist terms in reference to the election. They normalized and scored the data to indicate the prevalence of hate speech in different states, allowing them to visualize and compare the distribution of racist tweets across the US.
floatingsheep: Mapping Racist Tweets in Response to President Obama’s Re-election
http://www.floatingsheep.org/2012/11/mapping-racist-tweets-in-response-to.html?m=1