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<a href="https://www.iopenv.com" rel="nofollow ugc">iOpenV</a>
add rel=”nofollow” html tag “a” on external domain link, comments popup link and more link. 给评论链接、阅读全文、站外域链接链接增加rel=”nofollow”。

WordPress SEO nofollow

jonkemp

texttheater

Improves your blog’s search engine optimization by “noindexing” pages you choose.
Add the <code>noindex</code> robots meta tag to archives, categories, search pages, tags, author pages, login, admin pages or any other page you choose.
Add the <code>rel="nofollow"</code> attribute to individual pages listed by the <code>wp_list_pages</code> function or the Pages widget. Also, add the <code>rel="nofollow"</code> attribute to archive links, category links, registration and login links.
Written by Jon Kemp, currently maintained by Kilian Evang.
<h3>Usage</h3>
After installation, the settings page for this plugin can be found in your WordPress administration interface under Settings → Ultimate noindex.

Ultimate Noindex Nofollow Tool II

Improves your blog's search engine optimization by "noindexing" pages you choose. Now also for page-based (as opposed to date-based) archives.

WordPress SEO nofollow vs Ultimate Noindex Nofollow Tool II