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01.05.07
What You Should Know About Trackback Spam
 By
Danny Wirken
Trackback facilitates communication between blogs.
When a blogger writes a new entry whether to comment on or refer to an entry found at another blog, the commenting blogger can notify the other blog with a Trackback ping. The receiving blog will display summaries and links to all the commenting entries below the original entry. Trackback spam is when Trackback pings to a site that directs viewers to a totally unrelated URL.
Trackback Explained
Trackback as initially released is an open specification both as a protocol and as a feature of Movable Type 2.2. This contained the first implementation of Trackback. It has always been planned as an open system or a system that could easily be implemented in other blogging tools. This is because of the fact that the real value of Trackback can only be realized when many sites support it.
Basically, Trackback is designed to provide a method of notification between websites. This is a way of one person saying to another that "This is something you may be interested in". This can be done when a person sends a Trackback ping to the other.
Trackback is a form of remote comments where one person who wishes to comment on a post in another person's blog writes a post on his own weblog rather than posting the comment directly on the other person's weblog. The person commenting simply sends a Trackback ping to notify the other. Of course, this is only possible when both blogging tools support the Trackback protocol.
Trackback is likewise a form of content aggregation. When a person writes a post on a topic that a group of people are interested in, he/she sends a Trackback ping to a central server whereby all visitors can read all posts about the topic. Anyone interested in reading about a specific topic could look at the site to continue being updated on what bloggers have to say about it.
Blogging software that supports the Trackback protocol displays a "Trackback URL" along with every entry. This URL is used by the commenting blogger to send XML-formatted information about the new entry to this URL through his/her software. There are some blogging tools that are able to discover this Trackback URL automatically while others require the manual entry by the commenting blogger.
The protocol of Trackback is based on the principle of initiating the connection when sharing of information is desired rather than waiting for this same information to be discovered by other websites. Sites can communicate about related resources and are able to accomplish the automatic listing of all sites that have referenced a particular post. The ping also provides a firm, explicit link between entries as opposed to an implicit link that depends upon outside action.
Trackback is particularly useful in finding out whether other people are thinking well enough about what a person has written on a weblog to actually link to it. However, allowing Trackback links will require more site maintenance to remove Trackback links that are no longer valid. The capability of listing anyone who has placed a link to a site on one's blog can be abused by spammers.
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