Avoid tricks intended to improve search engine rankings. A good rule of thumb is whether you'd feel comfortable explaining what you've done to a website that competes with you. Another useful test is to ask, “Does this help my users? Would I do this if search engines didn't exist?” - Google Quality Guidelines
Major search engines like Google, Yahoo, MSN, and Ask do not like the following spam techniques. Do NOT use these for you Search Engine Optimization.
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Hidden text or hidden links.
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Automated queries to Google.
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Pages loaded with irrelevant keywords.
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Multiple pages, sub domains, or domains with substantially duplicate content.
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“Doorway”pages created just for search engines, or other“cookie cutter” approaches such as affiliate programs with little or no original content.
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Misuse of competitor names/products
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Pages in great quantity, which are automatically generated or of little value
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Pages that use excessive pop-ups, interfering with user navigation
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Pages that use methods to artificially inflate search engine ranking
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Sites with numerous, unnecessary virtual hostname's
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Excessive cross-linking with sites to inflate a site's apparent popularity
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Pages that seem deceptive, fraudulent, or provide a poor user experience
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Having duplicate content
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Having metadata that does not accurately describe the content of a web page
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Including off-topic or excessive keywords
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Fabricating pages to lead users to other web pages
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Using intentionally misleading links
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Misusing affiliate or referral programs