On the google webmaster tools I have been going through the latest links to my site and found a PR N/A page on a PR 0 domain http://vidgrids.com/biggest-dump-truck Would this be a link that should be disavowed? The same questions for this one http://uk.siteslikesearch.com/sites-similar-to/tryayurveda.com Tryayurveda has nothing to to with my content, so it couldn't even be considered relevant. The worlds biggest dump truck is relevant, but I don't know if the PR 0 and PR N/A are hurting my site