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30 Specialist (And Super Smart) Search Engines
http://stonet.co/IFFBV5 via @LifeHacks
Vertical search engines can optimize their search around their specific vertical area. For example, they may be able to leverage specialized databases, or knowledge about how people search for their type of item. The major search engines offer a lot of vertical search options (images, video, local to name 3) but this is a great list of other vertical search tools.
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