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I think Tom gave you excellent advice. I generally do not think about spam links if there part of my website and a legitimate part in the footer. For instance I link my terms of service and by privacy policy there however I would not walk them because Google and moreover some states particularly California have extremely strong policies on advertising and tracking people that go to your website and what you have to disclose. I would not use the footer for more than 2 to 3 links but that's just me. As Tom said if you think it is possibly something Google might not want no follow the link. this will at least confirm Tom Roberts answer is correct, Thomas