In addition to comments – as discussed last Wednesday – you’re also likely to see ‘pingbacks’. These aren’t actually comments; they are simply notifications that someone has added a link to your site. Quite often, this may be you, if you’re linking between content on your site. They look like this:
Basically, a pingback is a method for web authors to request notification when somebody links to one of their documents. Typically, web publishing software will automatically inform the relevent parties on behalf of the user, allowing for the possibility of automatically creating links to referring documents.
For example, Alice writes an interesting article on her blog. Sam then reads this article and comments about it, linking back to Alice’s original post. Using pingback, Sam’s software can automatically notify Alice that her post has been linked to, and Alice’s software can then include this information on her site.
With many sites, a link is then added inside a page to one of the posts. This sends you a ‘pingback’ comment, but it’s just to tell you that there has been a link to one of your post items.
Typically, we don’t recommend approving these, as they don’t hold any value for visitors, and may be confusing for some of them. If you are getting links from other sites, this can come in handy for tracking purposes. Unfortunately, WordPress doesn’t have any built-in ability to stop them coming through.