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

feedmeastraycat

WordPress removes the Update Services ability (Settings – Writing) when you create a network (aka enables WordPress MU/Multisite). 
Activate this plugin to get it back.
Note: This is only for WordPress setups with a network, aka multiple sites, aka multisites, 
aka WPMU in WordPress 3 and later.
This plugin might work with older WordPress MU sites. I haven’t tested it though. If you do, please 
let me know how it turned out.
<h3>Files</h3>
<ul>
<li>/activate-update-services/activate-update-services.php</li>
<li>/activate-update-services/README.txt</li>
</ul>

Activate Update Services

WordPress removes the Update Services ability when you create a network. Activate this plugin to get it back.

SD Simple Antispam vs Activate Update Services