What is the 3 way linking ?

[batman]

3 way linking is a loop link building. Suppose there are 3 sites. Site 1 linking to site, site 2 linking to site 3 and site 3 linking to again site 1. In this way they can avoid link penalty but as now search engines have evolved a lot as Google's penguin algorithm these type of link building tactics are no longer in play. They also can red flag your site including penalty of banned from the search engines.