Lo sapevamo da tempo e non ci stancheremo mai di ripeterlo, ma adesso abbiamo la conferma ufficiale: il meta tag keywords è COMPLETAMENTE INUTILE ai fini del posizionamento.

http://www.mattcutts.com/blog/keywor...in-web-search/

http://googlewebmastercentral.blogsp...-meta-tag.html

Our web search (the well-known search at Google.com that hundreds of millions of people use each day) disregards keyword metatags completely. They simply don't have any effect in our search ranking at present.
Google has ignored the keywords meta tag for years and currently we see no need to change that policy.