One of the most widely used form of spamdexing method in today's market is comment spam. This method involves the use of random and irrelevant comments, commonly promoting a commercial service in blogs, in wikis, guestbooks, or any other publicly accessible online discussion board. According to many experts, this has become a very big problem not only for many search engines, but also with many bloggers.
The reason why this is still a widely used form of spamdexing, many search engines have yet to discover a proper solution to this problem. However, according to many SEO Philippines experts, there have been several solutions introduced by many bloggers as well as experts to avoid being attacked by these spamdexing methods. Here are some of the methods used by bloggers and many other webmasters in preventing comment spams:
nofollow Tag
The nofollow tag is a solution introduced by Google itself. Google announced in early 2005 that hyperlinks with rel"nofollow" attribute would not be crawled or influence the link target's ranking in the search engine's index. The Yahoo and MSN search engines also respect this tag. Though it prevented manual spamming, it still doesn't solve the problem of automated spamming machines, which can still be a problem for many bloggers.
Another is that according to many bloggers, the use of nofollow tags can also be a dual-edge sword. According to many SEO Philippines experts, other than a disadvantage for spammers, this can also be a disadvantage for bloggers. This is because not all of those that comments in their blogs or wikis are spammers. The nofollow tag is said to reduce the value of legitimate comments.
Validation codes (CAPTCHA)
One of the most widely used form of preventive measures that bloggers have come to use are validation softwares. This primarily used to prevent the use of automated spam comments because it requires a validation prior to publishing the contents of the reply form. The goal is to verify that the form is being submitted by a real human being and not by a spam tool and has therefore been described as a reverse Turing test. The test should be of such a nature that a human being can easily pass and an automated tool would most likely fail.
Many forms on websites take advantage of the CAPTCHA technique, displaying a combination of numbers and letters embedded in an image which must be entered literally into the reply form to pass the test. In order to keep out spam tools with built-in text recognition the characters in the images are customarily misaligned, distorted, and noisy.
According to many experts, such as those from SEO Philippines companies, the combination of these two, which is the nofollow and validation, is what secures a blog, guestbooks, or wikis from spammers.
Visit
http://www.myoptimind.com for more info.