Google's head of webspam team Matt Cut and Jason Shellen from Blogger.com in 2005 bring concept of nofollw.
Google has started discouraging link exchange and link buying by implanting anew algorithm in his search engine that not only detects link fraud but even gives you negative marking when it founds link exchange or paid links.
Even you are a very good writer and you have got a very nice page rank it may harmful to you. If you have shared a link( that everyone does) then when you give a genuine link about credit or something googlebot may detect it as a paid or shared link. So it’s a time to prevent to get lower or negative page rank. I am going to share a information that will prevent from this.
This is called as nofollow attribute/relationship without going link so that will prevent that will tell googlebot or another search engine to stop following this link so it will show lower outgoing link.That can be done by two method either by using any blog writer like live writer from Microsoft in which you can customize your outgoing link by simply going in advace tab of hyperlink and select nofollow attribute. The another method is that add manually nofollow attribute like bellow.
