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"They then analyzed the raw text in those messages with a model trained to pick out regional differences such as favored Twitter slang terms ("hella" in Northern California, "wasssup" in New York) as well as sport-team preferences (for example, the Celtics in Boston, the Knicks in New York, the Cavs in Cleveland).
The researchers found that Twitter postings also reflect well-known regionalisms from spoken speech, such as Southerners' "y'all" vs. Pittsburghers' "yinz," and the regional-based references to soda vs. pop vs. Coke.
The model, verified with the geotag information, could predict the location of a microblogger in the U.S. to within 300 miles."
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