Matt Cutts of Google discusses whether blog comments are SPAM

Matt Cutts talks about ,whether all comment links are spam

Matt Cutts discusses whether or not all comment links are spam and suggests that people always use their real name when leaving a comment. He also mentioned that if these links make up too much of your link profile then it could be looked at as a link scheme. The main takeaway is to not use a keyword as your name when leaving a comment, even if the comment is on topic and adds value to the conversation.