Definition of "pingback" [pingback]

• A message automatically sent to a blog when one of the blogger's entries is referenced by another blogger. (noun)

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• "A pingback is similar to a trackback, and often confused with one another, enough so they are now considered the same."
• "Or is there some automatic pingback which is generated when someone posts to a blog?"
• "DELETE FROM wp_comments WHERE comment_type = 'pingback';"