:SugarwareZ-055:
By relying so much on issues such as keyword density which were directly within a webmaster's control, early search engines suffered from abuse and rating manipulation.
:SugarwareZ-294:
To provide improved results to their users, search engines had to adapt to ensure their results pages showed the most related search results, rather than unrelated pages stuffed with numerous keywords by unscrupulous webmasters. Since the victory and popularity of a search engine is determined by its ability to produce the most relevant results to any given search, allowing that outcome to be false would turn users to find other search sources. Search engines responded by developing more multifaceted ranking algorithms, taking into account additional factors that were more hard for webmasters to manipulate.
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