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A link is determined to be either a DoFollow or NoFollow by the rel tag added to the link. If the link does not have the “rel” tag then it is automatically set to be a DoFollow. When a link is placed anywhere on the internet (Website, blog, forum, YouTube, etc) it will pass some of the link popularity of the page/site where the link is located to the website it is pointing too.
NoFollow links where introduced to solve the problem mentioned above. To stop spammers gaining value from links that where just spam and should not have been adding value to the websites they where pointing to, the NoFollow tag was born. Now most links that are posted in forums, blogs, basically anywhere you can comment are tagged with NoFollow.
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