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Hi Muhammed, When you mention a link network, people immediately think about sites like BMR that have been thoroughly penalized. I wrote about them here: http://moz.com/blog/unnatural-link-warnings-blog-networks-advice It's a risky strategy, and definitely not my favorite. That said, I think you can inter-link your sites if you do it correctly. For example, you can link to content pieces from one site to another when the topics happen to overlap. I've linked from a philosophy site I own to a jewelry site when the jewelry site got deep on what jewelry means to us. What I wouldn't do is create 12 sites on the same topic and build a link wheel. I'd also advise you not to cross-link on a site-wide basis just because you own the site. It has to make sense to a reasonable user. Otherwise you'll get caught, re-penalized, and end up wasting a bunch of time that could have been spent actually gaining real life attention.