Google offer the option of adding a NOFOLLOW tag when adding a link to a blog post:
The Google help for this attribute states a number of reasons why you would want to use this tag. I think that the major reason is the transference of page rank. I have also heard that they insist you use it when you are using revenue generating methods such as Adsense.
The Google help for this attribute states a number of reasons why you would want to use this tag. I think that the major reason is the transference of page rank. I have also heard that they insist you use it when you are using revenue generating methods such as Adsense.
- Paid links: A site's ranking in Google search
results is partly based on analysis of those sites that link to it. In
order to prevent paid links from influencing search results and
negatively impacting users, we urge webmasters use
nofollow
on such links. Search engine guidelines require machine-readable disclosure of paid links in the same way that consumers online and offline appreciate disclosure of paid relationships (for example, a full-page newspaper ad may be headed by the word "Advertisement"). More information on Google's stance on paid links.
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