I have a domain and have created several subdomains and in the footer I'm linking to the other subdomains: e.g. my domain is: www.trees.com my subdomains are: www.evergreen.trees.com www.christmas.trees.com www.oak.trees.com www.olive.trees.com www.pine.trees.com I have about 5 of these subdomains but i'll be creating a few more every month. In my footer of each subdomain I'm linking to the other subdomains like this: PHP: <a href="www.evergreen.trees.com">Evergreen Trees</a><a href="www.christmas.trees.com">Christmas Trees</a><a href="www.oak.trees.com">Oak Trees</a><a href="www.olive.trees.com">Olive Trees</a><a href="www.pine.trees.com">Pine Trees</a> I heard that each subdomain is treated as a different website. I also heard that if sites from the same IP link to each other it's harmful to your SEO. Does this mean the footer links are harming all my subdomains as it my appear as a linkwheel to a GoogleBot?