Automattic

Donncha O Caoimh (a11n)

This plugin adds a stylesheet or image to your blog’s html source code. When a browser loads that stylesheet or image a cookie is dropped. If that user then leaves a comment the cookie is checked. If it doesn’t exist the comment is marked as spam. 
The plugin can also check how long it took a user to enter a comment. If it’s too fast it’s probably a spam bot. How fast can a legitimate user enter their name, email, web address and enter a well thought out comment?
For the adventurous, add these lines to your .htaccess and it will block spam attempts before they ever get to WordPress. Replace the Xs with the cookie that was set in your browser after viewing your blog. You can also find the cookie value by examining the page source code and looking for “css.php?k=XXXXXXXXXXXXXXXXXXX”. Make sure the lines go above the standard WordPress rules.
<pre><code> RewriteCond %{HTTP_COOKIE} !^.*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.*$
 RewriteRule ^wp-comments-post.php - [F,L]
</code></pre>
If you use WordPress MU, replace wp-comments-post.php above with wp-signup.php to block spam signups.
<pre><code> RewriteCond %{HTTP_COOKIE} !^.*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX.*$
 RewriteRule ^wp-signup.php - [F,L]
</code></pre>

Cookies for Comments

If you don't use any other spam filter plugins, then you can rely on this to stop spam comments for sure!

Must have, if you don't use any other spam filters!

I'd been getting a dozen spams a day on two of my sites. We installed "Stop Spam Comments" on one and "Cookies for Comments" on the other. Both worked perfectly. No more spam. Thanks!



very easy and no more spam!

Sets a cookie on a random URL that is then checked when a comment is posted. If the cookie is missing the comment is marked as spam.

Antonio Sanchez

Easy Cookie Law helps you to easily comply with the European cookie law. It shows a customizable notice to the user until he accepts or declines the use of cookies in your website. 
The message, position, and style of this notice can be easily modified through the plugin menu.
This plugin is good for your SEO since it will not add any CSS stylesheet or Javascript file. Everything is inline and kept to a minimum (<2KB).
It is also totally compatible with any cache plugin since only JavaScript code is responsible checking if the user already accepted the use of cookies, to show and to hide the banner, without any use of PHP, so your websites can be cached to HTML without a problem.
If you use Google Tag Manager, you can put the required scripts on your website directly with this plugin.
For detailed information see <a href="https://antsanchez.com/apps/easy-cookie-law-wordpress-plugin/" rel="nofollow ugc">Easy Cookie Law WordPress Plugin</a>.

Easy Cookie Law

Easy Cookie Law helps you to easily comply with the European cookie law. It shows a customizable notice to the user until he accepts or declines the u …

Cookies for Comments vs Easy Cookie Law