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We have generated new business from links that we have on client sites linking back to us. The new client will call/email us saying "we see you did example.com website, which we like, would you mind quoting for a redesign our website".  Without that link we may never have got that new piece of business. We always ask the client if we can place on link on their website and they all say ok. We don't do this for purely for SEO. The only thing we have done previously is to include the link in the footer of every page on the client site, which we are now in the process of changing to being only the client home page. With that in mind, is the following ok to do? Place text/image link in footer of client home page Link to be "nofollow" which goes to specific page on our own website e.g. oursite.com/portfolio/clientname.php on oursite.com/portfolio/clientname.php page we link back to client's home page, again this would be a "nofollow"

I'm not above re-visiting an old blog post, but like PeterM22 said, make your comment useful and relevant.  Sure, you're kind of using the blog for a backlink, but in exchange you're giving them some content that will pull in a long-tail visitor one day.  Or at least that's how I justify it in my head.