The most efficient types of links to the spider are one-way links, or links that only go from one site to another. This particular quirk is to keep people from simply trading a bunch of unrelated links between two sites to drive up the popularity inorganically.One-way links are now one of the most important criteria a search engine considers when it is time to rank sites, and as such, one-way link building companies are now touting one-way link building software to webmasters, some products better than others.
I think they are using it in order to slowly increase their rank on page.They share their links for the viewers to visit one link which linked from the other site.This is a good tactic.
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