A group of students and professors at a research site called Floating Sheep have built a comprehensive map of some of Twitter’s most distasteful content: the racist, homophobic, or ableist slurs that can proliferate online. Called Geography of Hate, the interactive map charts ten relatively common slurs across the continental US, either by general category or individually.
For a comparative and general overview of Twitter use worldwide, see this article in Foreign Policy Mapping the World.
