Just as Microsoft prefers the cure rather the prevention, an analogy can be deduced in search engines ability to treat every links equal. Of course they aren’t. Some are high valued as links hosted in great, popular sites. That is why it pays to be listed in Yahoo! Directory because one can be assured that Yahoo! keeps a credible list of sites. There are low valued as those links coming from a web page browsed by less than twenty unique visitors everyday.
But there are links that are so annoying that even calling them low valued is not enough. If high valued links have a score of 8 or 9, and low valued links 2 or 3, such annoying links should have 0 value.
What are these links that are annoying? They are the links that are placed on a web site A linking to another web site B just to dupe search engines that web site B is popular and are therefore being linked. How can you tell a web site is practicing this? Simple. You can easily track them in a web page that contains more than ten links pointing to one single web site. Why do we need ten links in a web page to emphasize the importance of a web site? When this is detected by search engine robots, a red flag is raised and the site (not just the page) is penalized by blacklisting it from appearing in search engine results.
So spammers have found a way to get around this: the blog. It used to be known than blog is a very important element in determining popularity of a site. What interests people interests the search engines. Afterall, search engines were made for the people. And the uncanny individuals cash in to the popularity of the blog, making it appear they did the same online journal. Wanna see an example?
It’s obviously rubbish to humans but was thought to be important to search engines. Until a tag was introduced to get rid of this pollution: the nofollow attribute.
Format is <a href=”somewebsite” rel=”nofollow”>Some Website</a>
While many blog providers such as MovableType uses this, many still do not. It remains to be seen when spam bloggers will realize what they’re doing does not do them any good as much as to the annoyed others.