OK, let's say you got an unnatural links warning and you are trying to clean up your link profile. In the case of a manual warning, you have to be sure that you get rid of (or document an attempt to get rid of) EVERY link that could be considered unnatural. I'd love to have a discussion on what exactly would be considered unnatural. I was talking with a webmaster who had such a warning, and reviewing his backlink profile and for some of the links it's tough to know whether they should be removed or not. You don't want to remove the good links that will help the site rank once the penalty is removed. Here are some types of links I was wondering about: A DMOZ listing - my thought is that this is white hat. But really, it's a link you created yourself, right? What do you think? Best of the Web listing - Same idea here. Friend's blog - A friend writes a blog post about you saying that everyone should visit with a link back to you. Industry related directory - Let's say you sell shoes. You're listed in a directory of the best places to buy shoes. A guest post on an authoritative site - We all know that easy to get guest posts could easily be looked at as spam. But let's say there is a site with good PR and authority and they only take the occasional guest post. You post on the site and get a link back to yours. In one sense it's authoritative, but on the other it's a link you built yourself in order to help your website. What do you guys think?