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NEW YORK (Reuters) – Google Inc prefabricated substantial changes to its see engine in a direct attack on companies that churn discover low-quality stories and videos.

The results of the improvements to Google's algorithms utilised to itemize see rankings over the happening few days strained nearly 12 proportionality of searches, Google said in a journal place on Thursday.

Google launched the clean-up after users urged stronger action against so-called noesis farms, which rely on armies of low-paid freelancers to crank discover stories and videos fashioned to appear higher on see engine results.

"This update is fashioned to reduce rankings for low-quality sites -- sites which are low-value add for users, copy noesis from another websites or sites that are meet not rattling useful," Google man Amit Singhal and principal organise Matt Cutts wrote in the journal post.

"At the aforementioned time, it module wage meliorate rankings for high-quality sites with example noesis and information much as research, in-depth reports, lost analysis and so on."

While Google did not cite companies it regards as noesis farms, the attach is often fastened to Demand Media, Yahoo Inc's Associated Content, and AOL's Seed, which publish stories on much topics as "how to make a essay lantern" or "five structure to sooth parched skin."

A major slice of noesis farms' income is generated through see engines. Demand Media, for instance, said 28 proportionality of its income came from Google in the first figure months of 2010.

"As strength be expected, a noesis accumulation as different as ours saw whatever noesis go up and whatever go down in Google see results," Larry Fitzgibbon, Demand Media executive vice chair of media and operations, wrote in a journal place on weekday in salutation to the Google changes.

"It's impossible to put how these or some changes prefabricated by Google impact some online playing in the daylong term but at this saucer in time, we haven't seen a material gain impact on our Content & Media business."

Shares of Demand Media, which debuted as a open consort in January, fell 1.6 proportionality to close at $22.96 on the New royalty Stock Exchange. The company's initial open offering was priced at $17 in January.

Google has been noise down on others, including retailer J.C. Penney, according to a New royalty Times report, that try and game Google algorithms to place broad in see results.

(Reporting by Jennifer Saba; Editing by Richard Chang)

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