Trackback
The purpose of Trackback is to let a site know that you are referencing them on your on site.
Usually, a Trackback will append a link to your site from the other blog. The TrackBack URL is different than the regular permanent link URL.
The downside of Trackback is that it can be abused for spamming purposes, so you should make sure to have some strong anti-spam tools enabled on your blog.
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