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spamdexing : ウィキペディア英語版
spamdexing

In computing, spamdexing (also known as search engine spam, search engine poisoning, Black-Hat SEO, search spam or web spam)〔( ''SearchEngineLand'', Danny Sullivan's video explanation of Search Engine Spam, October 2008 ) . Retrieved 2008-11-13.〕 is the deliberate manipulation of search engine indexes. It involves a number of methods, such as repeating unrelated phrases, to manipulate the relevance or prominence of resources indexed in a manner inconsistent with the purpose of the indexing system.〔"Word Spy - spamdexing" (definition), March 2003, webpage:(WordSpy-spamdexing ).〕
It could be considered to be a part of search engine optimization, though there are many search engine optimization methods that improve the quality and appearance of the content of web sites and serve content useful to many users. Search engines use a variety of algorithms to determine relevancy ranking. Some of these include determining whether the search term appears in the body text or URL of a web page. Many search engines check for instances of spamdexing and will remove suspect pages from their indexes. Also, people working for a search-engine organization can quickly block the results-listing from entire websites that use spamdexing, perhaps alerted by user complaints of false matches. The rise of spamdexing in the mid-1990s made the leading search engines of the time less useful. Using unethical methods to make websites rank higher in search engine results than they otherwise would is commonly referred to in the SEO (Search Engine Optimization) industry as "Black Hat SEO."
Common spamdexing techniques can be classified into two broad classes: ''content spam''〔 (or ''term spam'') and ''link spam''.〔
==History==
The earliest known reference〔 to the term ''spamdexing'' is by Eric Convey in his article "Porn sneaks way back on Web," The Boston Herald, May 22, 1996, where he said:
The problem arises when site operators load their Web pages with hundreds of extraneous terms so search engines will list them among legitimate addresses.
The process is called "spamdexing," a combination of spamming — the Internet term for sending users unsolicited information — and "indexing." 〔

Spamdexing is the practice of search engine spamming. It is a form of Search Engine Optimization (SEO) spamming, which is the art of making a website attractive to the major search engines for optimal indexing. Spamdexing is the practice of creating websites that will be illegitimately indexed with a high position in the search engines. Spamdexing is sometimes used to try and manipulate a search engine’s understanding of a category. The goal of a web designer is to create a web page that will find favorable rankings in the search engines, and they create their pages according to standards that they believe will help. Some of them resort to spamdexing, often unbeknownst to their clients.
While spamdexing has interfered with the finding of information on the internet, measures have been taken to curb it with some success. Spamdexing was a big problem in the 1990s, and search engines were fairly useless because they were compromised by spamdexing. Once Google came on the scene, that all changed – Google developed a page ranking system that fought against spamdexing quite well, discounting spam sites and awarding true, relevant websites with high page rankings.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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