Paid Links & Buying Links

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Buying links or paying for links (which pass PageRank) has been officially forbidden by Google & is against their TOS.

That means that any links you buy or sell with the intention of gaming the search engines can potentially damage your site or even get it removed from the search engine's index.

Buying links isn't necessarily prohibited, Google rightly state that it is "a normal part of the economy of the web when done for advertising purposes, and not for manipulation of search results." and that "links purchased for advertising should be designated as such."

There are a few ways to do this but the most effective is to use the rel="nofollow" tag to tell the search spiders not to follow that particular link & not to pass any PageRank (reputation) along with it.

So, stop building sites just to gain PR & therefore to sell links & bring your online money making efforts into the 21st century!

Don't believe me? Here is Google's official stance.