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		SECTIONS Keyword Research Optimization In Depth Search Engine Submission Search Engines Directories Pay-per-Click Advertising Meta-Crawlers		META-CRAWLERS The most widely used meta-crawlers are listed below. Meta-Crawlers continue to gain popularity because they gather results from multiple search engines, directories, and pay-per-click engines to populate search results. While an optimization effort will not directly be targeted at meta-crawlers, proper optimization for the top search engines, directories, and pay-per-click engines should result in extremely strong meta-crawler relevancy. MetaCrawler Dogpile Search.com Ixquick Mamma qbSearch SurfWax Vivisimo next >>>