The Refback is the third type of "linkback" described by Six Apart, . It's not commonly referred to but is a way of determining who is referring to your posts within their posts. Once again an automatic function and it doesn't require any input or contact by either the original writer or the referencing writer.

"A Refback is also a link.  In this case, however, Site A (link originator) does not need to "tell" anything to Site B (receptor). Instead, the receptor Site "discovers" this li...
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