David Mihm, works at Moz, the annual publisher of the "local rankings factors" survey and also an observer of local search wrote an article on "Hummingbird's Unsung Impact on Local Search": Hummingbird's Unsung Impact on Local Search - Moz

He argues that strong directories might be making a comeback. Here are some of his conclusions:
Reports of directories' demise have been greatly exaggerated. For whatever reason, Google seems to be giving directories a renewed lease on life....
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Strong directories making a come back?