If you have a blog, you know that you will get lots of people making comments on your posts with links back to all sorts of unsavory pharmaceuticals which usually have nothing to do with the topic of that post or your blog.
The main reason they are doing this is to create back links to their sites for SEO.
To discourage content spam as this practice is called, Google came up with the rel=”nofollow” tag. It is detailed in their post about content spam.
You add this to any links to tell the google bots not to pass any link juice to those links. Eventually, you will discourage this practice. Time will tell.
If you want to find out which links are followed or no followed on a page, you should get the very useful add on for firefox called “Seo for firefox” which will color all no follow links red on the page. If you have never done this before, try it out. But first you will need to use a firefox browser.
If your blog is built on wordpress, just install the amazing akismet plugin which will act like a spam filter and filters out all comments with the most common spam phrases. Every blog needs this.
