PR external connection
 

Webmaster A: for in the pr update A leap, I now is in the crazy do external chain, mainly is the exchange of friendship links, as long as pr high I can change.
Webmaster B: I bought a few pr high link. As soon as the pr updated.
Webmaster A and B practice is not desirable, A good web site is not only to have A good ranking, more to have higher weight. Blindly pursue website pr value, the final result is only site has been K, the website lose value.