Google’s link disavowal tool allows publishers to tell Google that they don’t want certain links from external sites to be considered as part of Google’s system of counting links to rank web sites. Some sites want to do this because they’ve purchased links, a violation of Google’s policies, and may suffer a penalty if they can’t get the links removed. Other sites may want to remove links gained from participating in bad link networks or for other reasons. The disavow links tool launched in October 2012, and more about it can be found in our coverage below.