What are WordPress trackbacks and how to clean them?
Trackbacks notify other website owners that you have linked to their article on your website.
However, trackbacks can be exploited by spammers to distribute large amounts of spam, aiming to get their links posted on many sites. If you do not use trackbacks, it is best to deactivate and clean them.
You can either use our Advanced Database Cleaner plugin to remove these trackbacks or execute the following SQL code (used by the plugin) directly via phpMyAdmin:
DELETE FROM comments WHERE comment_type = 'trackback'