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nofollow is an HTML attribute value used to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index. It is intended to reduce the effectiveness of certain types of search engine spam, thereby improving the quality of search engine results and preventing spamdexing from occurring. The concept for the specification of the attribute... Read enhanced Wikipedia article

Factz from Wikipedia: we found the following about nofollow help

prevented  
links.

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Meta element The noindex value prevents a page from being indexed, and nofollow prevents links from being crawled.

reduced  
value.

Results for "nofollow reduced value"

Spam in blogs Nofollow may reduce the value of legitimate comments

made  
techniques.

Results for "nofollow made techniques"

Spam in blogs Using rel="nofollow" is a much easier solution that makes the improvised techniques above irrelevant.

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    nofollow

    nofollow is an HTML attribute value used to instruct some search engines that a hyperlink should not influence the link target's ranking in the search engine's index.
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    Lorraine Krystal

    <a href="#cite_ref-Vanessa_Hudgens_Official_MySpace_4-0" title="">^</a> "<a href=" http://www.myspace.com/vanessahudgens" class="external text" title=" http://www.myspace.com/vanessahudgens" rel="nofollow">myspace.com/vanessahudgens</a>".
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    Spam in blogs

    Google announced in early 2005 that hyperlinks with rel="nofollow" attribute would not influence the link target's ranking in the search engine's index.
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    PageRank

    Google advises webmasters to use the nofollow HTML attribute value on sponsored links.
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    Meta element

    The noindex value prevents a page from being indexed, and nofollow prevents links from being crawled.
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    Methods of website linking

    Underlinking also occurs when web pages use the rel=nofollow attribute to prevent search engines from considering these links when performing link analysis, weighting or ranking.
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    Attention economy

    An attempt to change the economics of one kind of web spam is the "nofollow" attribute for hyperlinks, which causes search engines to ignore those links for the purposes of ranking results.
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    Andrew M Robertson

    ... class="external text" title=" http://www.arobcorp.com/" rel="nofollow">www.arobcorp.com</a>, <a href=" http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=314461926/"... http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=314461926" rel="nofollow"> http://profile.myspace.com/id=314461926</a><a... http://www.face-pic.com/pages/view_profile.php?user=Silentone2000" rel="nofollow"> http://www.face-pic.com/pages/view_profile.php?user=Silentone2000</a>
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    Web directory

    Some directories may prevent search engines from rating a displayed link by using redirects, nofollow attributes, or other techniques.
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    Spamdexing

    In early 2005, Wikipedia implemented a default 'nofollow' value for the 'rel' HTML attribute.
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