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Thanks heaps Charles and lesterj as well. I've had a look into Google's view on widgets and it looks like you might be right so we've just changed the code on the widget so that the link back to us is nofollow (somewhat counter-intuitive!) We've also just submitted a disavow on the worst offending links/domains. .... so fingers crossed! Guess we have to wait for Google to crawl all of these sites to see an impact though.