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Hummingbird is a major change. It really shifts search away from keywords to semantic and contextual searches. Combined with Google’s decision to make search term data unavailable to the public, this significantly complicates SEO efforts. Frankly, this may be a good thing in the long term if it prevents gaming the system in a way that makes a website show up higher in the search terms only because of keyword use, versus a site with better content but a less aggressive SEO effort.