rel="nofollow"

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= rel="nofollow" =
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<entry-title>rel="nofollow"</entry-title>
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{{TOC-right}}
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__TOC__
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== Specification 2005-01-10 ==
== Specification 2005-01-10 ==
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{{MicroFormatCopyrightStatement2005}}
{{MicroFormatCopyrightStatement2005}}
* [[User:Tantek|Tantek]]: I release all my contributions to this specification into the public domain and I encourage the other authors to do so as well.
* [[User:Tantek|Tantek]]: I release all my contributions to this specification into the public domain and I encourage the other authors to do so as well.
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* [[User:Kevin Marks|Kevin Marks]]: I release all my contributions to this specification into the public domain and I encourage the other authors to do so as well.
** When all authors/editors have done so, we can remove the MicroFormatCopyrightStatement template reference and replace it with the MicroFormatPublicDomainContributionStatement.
** When all authors/editors have done so, we can remove the MicroFormatCopyrightStatement template reference and replace it with the MicroFormatPublicDomainContributionStatement.
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== Abstract ==
== Abstract ==
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RelNoFollow is an [[elemental-microformat|elemental microformat]], one of several [[microformats|microformat]] open standards. By adding <code>rel="nofollow"</code> to a hyperlink, a page indicates that the destination of that hyperlink {{should not}} be afforded any additional weight or ranking by user agents which perform link analysis upon web pages (e.g. search engines). Typical use cases include links created by 3rd party commenters on blogs, or links the author wishes to point to, but avoid endorsing.  For more specific endorsement (or lack thereof) semantics, see [[vote-links|VoteLinks]].
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<p class="entry-summary">RelNoFollow is an [[elemental-microformat|elemental microformat]], one of several [[microformats|microformat]] open standards. By adding <code>rel="nofollow"</code> to a hyperlink, a page indicates that the destination of that hyperlink {{should not}} be afforded any additional weight or ranking by user agents which perform link analysis upon web pages (e.g. search engines). Typical use cases include links created by 3rd party commenters on blogs, or links the author wishes to point to, but avoid endorsing.  For more specific endorsement (or lack thereof) semantics, see [[vote-links|VoteLinks]].</p>
== XMDP profile ==
== XMDP profile ==
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<pre><nowiki>
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The following is an [http://gmpg.org/xmdp/ XMDP] profile for the [[rel-nofollow]] specification.
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=== URLs ===
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This profile is hosted as a separate XMDP file on microformats.org:
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* http://microformats.org/profile/rel-nofollow
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* shortURL: http://ufs.cc/x/rel-nofollow
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=== Usage ===
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Profiles are referenced in (X)HTML files in the &lt;HEAD&gt; tag, e.g.:
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<source lang=html4strict>
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<head profile='http://microformats.org/profile/rel-nofollow'>
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</source>
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=== Profile ===
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<source lang=html4strict>
<dl class="profile">
<dl class="profile">
  <dt id="rel">rel</dt>
  <dt id="rel">rel</dt>
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   <a rel="help" href="http://www.w3.org/TR/html401/struct/links.html#adef-rel">
   <a rel="help" href="http://www.w3.org/TR/html401/struct/links.html#adef-rel">
     HTML4 definition of the 'rel' attribute.</a>   
     HTML4 definition of the 'rel' attribute.</a>   
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   Here is an additional value.</p>
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   Here is an additional value as defined in the
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  <a rel="help start" href="http://microformats.org/wiki/rel-nofollow">
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  rel-nofollow specification</a>
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  .</p>
   <dl>
   <dl>
   <dt id="nofollow">nofollow</dt>
   <dt id="nofollow">nofollow</dt>
   <dd>Indicates that the referred resource was not necessarily linked to  
   <dd>Indicates that the referred resource was not necessarily linked to  
       by the author of the page, and thus said reference should not afford  
       by the author of the page, and thus said reference should not afford  
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       the referred resource any additional weight or ranking by user agents. </dd>
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       the referred resource any additional weight or ranking by user agents.
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  </dd>
   </dl>
   </dl>
  </dd>
  </dd>
</dl>
</dl>
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</nowiki></pre>
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</source>
== examples in the wild ==
== examples in the wild ==
This section is informative.
This section is informative.
Note: There are numerous uses of rel-nofollow in the wild, this is very much an incomplete list. If your site marked up with rel-nofollow, feel free to add it to the top of this list. Once the list grows too big, we'll make a separate wiki page ([[rel-nofollow-examples-in-wild]]).
Note: There are numerous uses of rel-nofollow in the wild, this is very much an incomplete list. If your site marked up with rel-nofollow, feel free to add it to the top of this list. Once the list grows too big, we'll make a separate wiki page ([[rel-nofollow-examples-in-wild]]).
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* [http://funadvice.com FunAdvice] supports using the rel-nofollow tag to prevent users posting content simply for the search engine benefit, to improve teh quality of the advice giving community.
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* [http://funadvice.com FunAdvice] supports using the rel-nofollow tag to prevent users posting content simply for the search engine benefit, to improve the quality of the advice giving community.
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== bad examples in the wild ==
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This section is informative.
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There are now numerous abuses of rel-nofollow, in particular, where it is used on *2nd party* links, rather than the original intention of *3rd party* links such as in blog comments. The primary abusers of rel-nofollow are content hosting / social network sites.
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* [http://flickr.com/ Flickr] puts "nofollow" on comments by the content publisher themselves (should only be on 3rd party comments), e.g. http://www.flickr.com/photos/tantek/2344425887/ as well as on profile links e.g. website: http://www.flickr.com/people/microformats/
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* [http://twitter.com/ Twitter] puts "nofollow" on account holders' profile links,  in the "description" and "web site" fields, e.g. http://twitter.com/indiewebcamp (links in posts do not have "nofollow" yet are wrapped with "t.co" URLs).
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* ... nearly every other content hosting / publishing site - please add more specific examples with direct URLs to pages abusing "nofollow".
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=== exceptions ===
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It may seem odd to explicitly list *non* examples in an examples in the wild section, but such non-examples may be useful to help convince the bad examples in the wild to change their behavior:
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* [http://blogspot.com/ Blogspot] does NOT put "nofollow" on content publisher links, e.g. http://epeus.blogspot.com/2012/03/when-youre-merchandise-not-customer.html
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* [http://tumblr.com/ Tumblr] does NOT put "nofollow" on content publisher links, e.g. http://adactio.tumblr.com/post/27135731578/the-web-unusually-came-with-a-view-source
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* ... (let's hope we find more such non-examples)
== normative references ==
== normative references ==
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*** nonauth - [http://www.mnot.net/blog/2003/12/29/comment_spam_and_google Mark Baker]
*** nonauth - [http://www.mnot.net/blog/2003/12/29/comment_spam_and_google Mark Baker]
*** norank - [http://www.digitalburg.com/ Ben Pierce]
*** norank - [http://www.digitalburg.com/ Ben Pierce]
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*** notally - Patrick Mackaaij
* '''Efficacy'''.  nofollow will not affect spamming behavior.
* '''Efficacy'''.  nofollow will not affect spamming behavior.
* '''Collateral Damage'''. If tools automatically add nofollow to all 3rd party links, then many legitimate non-spam links will be ignored or given reduced weight, and thus the destination of such links will be unfortunate casualties.
* '''Collateral Damage'''. If tools automatically add nofollow to all 3rd party links, then many legitimate non-spam links will be ignored or given reduced weight, and thus the destination of such links will be unfortunate casualties.
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=== additional lists of issues ===
=== additional lists of issues ===
Additional lists of issues raised against rel="nofollow" can be found at the following site(s):
Additional lists of issues raised against rel="nofollow" can be found at the following site(s):
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* http://www.nonofollow.net/
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* [https://web-beta.archive.org/web/20061205020420/http://nonofollow.net/index.php?title=Main_Page nonofollow.net]
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Matt Cutts Says No to Nofollow On Internal Links:
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* 2013-09-13 [https://www.youtube.com/watch?v=86GHCVRReJs Matt Cutts on YouTube]
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[[Category:Specifications]]
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[[Category:rel-nofollow]]
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== articles ==
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When this section gets too big, we can move it to [[rel-nofollow-articles]].
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* [http://searchenginewatch.com/3633972 2009-06-03 Search Engine Watch: Google Changes Course on Nofollow]
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* [http://reference.sitepoint.com/html/rel-mf#rel__nofollow SitePoint reference: rel- Microformats / nofollow] by Ian Lloyd

Current revision

Contents

Specification 2005-01-10

Editors

Concept

Copyright

This specification is (C) 2005-2020 by the authors. However, the authors intend to submit (or already have submitted, see details in the spec) this specification to a standards body with a liberal copyright/licensing policy such as the GMPG, IETF, and/or W3C. Anyone wishing to contribute should read their copyright principles, policies and licenses (e.g. the GMPG Principles) and agree to them, including licensing of all contributions under all required licenses (e.g. CC-by 1.0 and later), before contributing.

Patents

This specification is subject to a royalty free patent policy, e.g. per the W3C Patent Policy, and IETF RFC3667 & RFC3668.

Abstract

RelNoFollow is an elemental microformat, one of several microformat open standards. By adding rel="nofollow" to a hyperlink, a page indicates that the destination of that hyperlink SHOULD NOT be afforded any additional weight or ranking by user agents which perform link analysis upon web pages (e.g. search engines). Typical use cases include links created by 3rd party commenters on blogs, or links the author wishes to point to, but avoid endorsing. For more specific endorsement (or lack thereof) semantics, see VoteLinks.

XMDP profile

The following is an XMDP profile for the rel-nofollow specification.

URLs

This profile is hosted as a separate XMDP file on microformats.org:

Usage

Profiles are referenced in (X)HTML files in the <HEAD> tag, e.g.:

<head profile='http://microformats.org/profile/rel-nofollow'>

Profile

<dl class="profile">
 <dt id="rel">rel</dt>
 <dd><p>
   <a rel="help" href="http://www.w3.org/TR/html401/struct/links.html#adef-rel">
     HTML4 definition of the 'rel' attribute.</a>  
   Here is an additional value as defined in the
   <a rel="help start" href="http://microformats.org/wiki/rel-nofollow">
   rel-nofollow specification</a> 
   .</p>
  <dl>
   <dt id="nofollow">nofollow</dt>
   <dd>Indicates that the referred resource was not necessarily linked to 
       by the author of the page, and thus said reference should not afford 
       the referred resource any additional weight or ranking by user agents.
   </dd>
  </dl>
 </dd>
</dl>

examples in the wild

This section is informative. Note: There are numerous uses of rel-nofollow in the wild, this is very much an incomplete list. If your site marked up with rel-nofollow, feel free to add it to the top of this list. Once the list grows too big, we'll make a separate wiki page (rel-nofollow-examples-in-wild).

bad examples in the wild

This section is informative. There are now numerous abuses of rel-nofollow, in particular, where it is used on *2nd party* links, rather than the original intention of *3rd party* links such as in blog comments. The primary abusers of rel-nofollow are content hosting / social network sites.

exceptions

It may seem odd to explicitly list *non* examples in an examples in the wild section, but such non-examples may be useful to help convince the bad examples in the wild to change their behavior:

normative references

informative references

open issues

These are open issues that have been raised about rel="nofollow" that have been raised in various forums, in particular, on the public W3C www-html mailing list. Once the list grows too big, we'll make a separate wiki page (rel-nofollow-issues). The issues have been grouped into four areas.

additional lists of issues

Additional lists of issues raised against rel="nofollow" can be found at the following site(s):

Matt Cutts Says No to Nofollow On Internal Links:

articles

When this section gets too big, we can move it to rel-nofollow-articles.

Categories

rel="nofollow" was last modified: Monday, February 26th, 2018

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