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Google doesn't use it and Matt Cutts, who said this several times before, is not aware of any major search engine that uses the meta keywords tag.
In a recent post by Perl guru and Google Books Engineering Manager Jon Orwant, the Google Books Ngram Viewer was announced. a tool for visualizing data in the Google Books corpus.
The Ngram Viewer searches more than 500 billion words from 5.2 million books in Chinese, English, French, German, Russian, and Spanish and lets you compare phrases from the datasets over time.
Just noticed that Google now suggests branded searches when searching for terms like laptop, as seen in the screenshot below the paid listing.
To quickly find out which country a country code top-level domain (ccTLD) belongs to, go to google.ccTLD and see what it says. Works in many cases still including China.
What happens when Google becomes your new roommate?