I have been talking about ethics when it comes to whether a site designer should or shouldn’t put a hyperlink back to their site at the footer of anew sites pages that they have just built. Here is more on the subject from SEO Roundtable
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Google apparently gives little wait to links in the footer section of websites anyhow. The links themselves are mostly from off-topic sites anyway. So the SEO value is minimal. But we do it as a company, I think it is a fair way of getting a bit of advertising. Our clients certainly do not complain.