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A Beginner's Guide to TrackBack

What Is TrackBack?

In a nutshell, TrackBack was designed to provide a method of notification between websites: it is a method of person A saying to person B, "This is something you may be interested in." To do that, person A sends a TrackBack ping to person B.

TrackBack ping: a ping in this context means a small message sent from one webserver to another.

And why would person B be interested in what person A has to say?

• Person A has written a post on his own weblog that comments on a post in Person B's weblog. This is a form of remote comments--rather than posting the comment directly on Person B's weblog, Person A posts it on his own weblog, then sends a TrackBack ping to notify Person B.
• Person A has written a post on a topic that a group of people are interested in. This is a form of content aggregation--by sending a TrackBack ping to a central server, visitors can read all posts about that topic. For example, imagine a site which collects weblog posts about Justin Timberlake. Anyone interested in reading about JT could look at this site to keep updated on what other webloggers were saying about his new album, a photo shoot in a magazine, etc.

History

TrackBack was first released as an open specification in August 2002. It was released as both a protocol and as a feature of Movable Type 2.2, which contained the first implementation of TrackBack. Since the true value of TrackBack only comes when many sites support it, TrackBack was always planned as an open system: a system that could be easily implemented in other weblogging tools.

To date, TrackBack has been implemented in the following tools:

• Movable Type
• Bloxsom
• Blojsom
• Nucleus
• B2
• Radio
• TrackBack standalone Tool