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петък, 18 януари 2013 г.
Getting indexed
The leading search engines, such as Google, Bing and Yahoo!, use
crawlers to find pages for their algorithmic search results. Pages that
are linked from other search engine indexed pages do not need to be
submitted because they are found automatically. Some search engines,
notably Yahoo!, operate a paid submission service that guarantee
crawling for either a set fee or cost per click. Such programs usually
guarantee inclusion in the database, but do not guarantee specific
ranking within the search results. Two major directories, the Yahoo
Directory and the Open Directory Project both require manual submission
and human editorial review. Google offers Google Webmaster Tools, for
which an XML Sitemap feed can be created and submitted for free to
ensure that all pages are found, especially pages that are not
discoverable by automatically following links.Search engine crawlers may
look at a number of different factors when crawling a site. Not every
page is indexed by the search engines. Distance of pages from the root
directory of a site may also be a factor in whether or not pages get
crawled.
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