By offering link exchanges from their site A and linking back from site B. It's define as linking each others with multiple sites, I add a link to you on blog A ,you link back to me at your blog B.
What Benefits in 3 Way Linking?
Reciprocal links can easy detect by search engine . Search algorithms may consider it a two way link trading as an artificial means of boosting the popularity of both sites.Search engine might give lower link juice for both side and discount the value of these links.
By doing a three way link from sites with different url, hosted on different servers ,it appear more natural to search engine as a vote for the site.It can build link popularity without the SE being able to detect the link trading as easily.
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