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What are the other types of SEO apart from Black, White, Gray Hat?
I don't really know much about seo, but I doubt there are any other types of seo. All I know that the main ones are black and white, haven't heard alot about grey hat seo. This a website which tells you the different between black and white hat seo, check it out http://www.whatisseo.com/types-of-seo.html