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 Google Instant went live on 9/9, read industry experts opinions on how this will affect SEO here, including contributions from White Hat SEO Marketing.  

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White Hat SEO Glossary Index

A black hat Seo technique. Various methods can be used to make text on a web page invisible to a human while remaining visible to a search spider. Some controversy about this and some of the techniques are considered grey hat but generally speaking a bad thing.