Tobiask

Simple Trackback Validation Plugin performs a simple but very effective test on all incoming trackbacks in order to stop trackback spam. Now with topsy.com blocker.
How it works:
When a trackback is received, this plugin
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checks for topsy.com trackbacks and marks this as spam.
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checks if the IP address of the trackback sender is equal to the IP address of the webserver the trackback URL is referring to. This reveals almost every spam trackback (more than 99%) since spammers do usually use bots which are not running on the machine of their customers.
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retrieves the web page located at the URL included in the trackback. If the page doesn’t a link to your blog, the trackback is considered to be spam. Since most trackback spammers do not set up custom web pages linking to the blogs they attack, this simple test will quickly reveal illegitimate trackbacks. Also, bloggers can be stopped abusing trackback by sending trackbacks with their blog software or webservices without having a link to the post.
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There are several options available and you also can enable logging to get all actions, which are performed by the plugin, logged. Also, you can select how to treat spam trackbacks (do not save in the database or mark as spam or place into moderation) and several other stuff.
Please visit <a href="http://sjmp.de/blogging/simple-trackback-validation-with-topsy-blocker/" title="Simple Trackback Validation with Topsy Blocker" rel="nofollow ugc">the official website</a> for further details and the latest information on this plugin.

Simple Trackback Validation with Topsy Blocker

REPLACEMENT of the original Simple Trackback Validation Plugin from Miachel. Performs a simple but very effective test on all incoming trackbacks in o …

Matthias Pfefferle

David Shanske

Terence Eden

Generates richer WordPress comments from linkbacks such as <a href="https://wordpress.org/plugins/webmention" rel="ugc">Webmention</a> or classic linkback protocols like Trackback or Pingback.
The limited display for trackbacks and linkbacks is replaced by a clean full sentence, such as “Bob mentioned this article on bob.com.” If Bob’s site uses markup that the plugin can interpret, it may add his profile picture or other parts of his page to display as a full comment. It will optionally show collections of profile pictures, known as Facepiles, instead of the full setences.
Semantic Linkbacks uses <a href="http://microformats.org/wiki/microformats2" rel="nofollow ugc">Microformats 2</a> to get information about the linked post and it is highly extensible to also add support for other forms of markup.
<h3>Privacy and Data Collection</h3>
This plugin collects data from sites that send webmentions for the purpose of displaying richer comments on a site. This data is under the control of the site owner. It is the personal responsibility of that individual or individuals to remove any information at the request of the original content creator. Over time, we will add additional tools to assist in doing so.
<h3>Thanks to</h3>
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<li>Pelle Wessman (<a href="https://github.com/voxpelli" rel="nofollow ugc">@voxpelli</a>) for his awesome <a href="https://github.com/voxpelli/node-webmention-testpinger" rel="nofollow ugc">WebMention test-pinger</a></li>
<li>Ryan Barrett (<a href="https://github.com/snarfed" rel="nofollow ugc">@snarfed</a>) for his feedback and pull requests</li>
<li>Barnaby Walters (<a href="https://github.com/barnabywalters" rel="nofollow ugc">@barnabywalters</a>) for his awesome <a href="https://github.com/indieweb/php-mf2" rel="nofollow ugc">mf2 parser</a></li>
<li>David Shanske (<a href="https://github.com/dshanske" rel="nofollow ugc">@dshanske</a>) for his feedback and a lot of pull requests</li>
<li>(<a href="https://github.com/acegiak" rel="nofollow ugc">@acegiak</a>) for the initial plugin</li>
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Semantic-Linkbacks

Richer Comments and Linkbacks for WordPress!

Simple Trackback Validation with Topsy Blocker vs Semantic-Linkbacks