Everybody knows what a blog comment is and what is it used for, but lately we hear more and more about the term ‘pingback’. In WordPress talk, the pingback (not to be confused with an ICMP ping) is a method used to notify us when someone links to us from their own blog.

For instance, I’m writing this post on my blog right now (blog A). Someone might find it useful and mention it in his blog (blog B). When he publishes his post, his WordPress scripts send a xmlrpc request to my blog. My blog then verifies the existance of the link in the post and if it’s there it automatically posts the pingback onsite as sucessful.

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