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The Art of SEO Highlight

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Google never used this tag for ranking at all, but Bing seems to make some reference to it (you can read about this in detail at http://searchengineland.com/meta-keywords-tag-101-how-to-legally-hide-words-on-your-pages-for-search-engines-12099

— Eric Enge and Stephan Spencer and Jessie Stricchiola and and Rand Fishkin

Replicated under Fair Use from The Art of SEO by Eric Enge and Stephan Spencer and Jessie Stricchiola and and Rand Fishkin.