Sverigedemokraterna IT

Prevents comment spam using various, admin-selectable techniques.
Available in:
<ul>
<li>English</li>
<li>Swedish</li>
</ul>
Logging is handled by <a href="https://wordpress.org/extend/plugins/threewp-activity-monitor/" rel="ugc">ThreeWP Activity Monitor</a>. See the list of logged activities to enable logging of caught spam.
Most spam is caught using “extra fields”. Rarely will spam require the use of “no author website” also. Extremely rarely will a spam bot be smart enough to include the hidden fields, leave them empty and leave the author URL empty.
Catching that last kind of spambot will require other measures.
<h4>Extra fields</h4>
Two extra fields are inserted into the comment form and hidden from view using CSS. They are to be left empty, and say as much, in order for the comment to pass.
Bots that spam by inserting fake POSTs will not have the required, invisible fields in the POST – rejecting the comment.
Bots that fill in all form fields will automatically fill in these extra fields – the comment will be rejected.
<h4>No author website</h4>
Comment authors are usually allowed to fill in their URLs. Selecting this technique will only allow comments that have an empty author URL field.
Bots that fill in all form fields will fail this test.
Note that you will need to edit your template to hide the author url input from view using <code>display: none</code>.

SD Simple Antispam

yanniks

This is the Shariff for WordPress plugin based on c’t Shariff.
For more information, check out the original <a href="https://github.com/heiseonline/shariff" rel="nofollow ugc">GitHub project</a> and the <a href="http://ct.de/shariff" rel="nofollow ugc">c’t information page</a>.
<blockquote>
Shariff enables website users to share their favorite content without compromising their privacy.
Facebook, Google+ and Twitter supply official sharing code snippets which quietly siphon personal data from all page visitors. Shariff enables visitors to see how popular your page is on Facebook and share your content with others without needless data leaks.
Shariff <code>(/ˈʃɛɹɪf/)</code> is an open-source, low-maintenance, high-privacy solution maintained by German computer magazine c’t and heise online.
</blockquote>
Shariff supports sharing buttons for Facebook, Twitter, Google+, LinkedIn, Pinterest, Reddit, StumbleUpon, XING, WhatsApp and mail. 
Select which color you want, set the button location, select the orientation fitting most to your website and set the TTL just as you want.

Shariff for WordPress

Shariff enables website users to share their favorite content without compromising their privacy.

SD Simple Antispam vs Shariff for WordPress