Will NoFollow Attribute Stop Spam?
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Increasingly it is felt that simply including nofollow attribute will not be able to arrest content-spamming. In fact, many blog software automatically include nofollow attribute in comment backlinks. Still spams are rampant.
One reason could be that content spammers make use of automated programs that dole out thousands of comments at the click of mouse targeted at vast multitude of blogs.
The second reason may be that spammers feel some links might just be clicked on and convert into sales. For them it is worth taking chance. Also, who knows some blogs may still be unaware of nofollow attribute!