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Either way, the algorithm has drastically changed.
In my categories:
Chamber of Commerce, University of, City of, Town of, County of
It's hard to say if Teoma is really using a true authority and hub site determination or faking it with a short list of authority keywords. Given a new entry into the top 10 on my SERP, it looks like they may be taking a shortcut. (Relatively new "County of" site in this update)