Right, fair enough. Stackoverflow used to add in a nofollow to all links posted on their site. I think they have removed it now for users of a certain rep. If

Right, fair enough. Stackoverflow used to add in a nofollow to all links posted on their site. I think they have removed it now for users of a certain rep. If your site is small, then just moderate the comments yourself. If there are not that many then it will not take much time!