An in-depth look at when you should or shouldn't use the new tool
Yesterday (Oct, 17th, 2012), Matt Cutts, Google’s resident spam-fighter, announced the release of a new webmaster tool. This tool is called “Disavow Links” and its purpose is to help website owners get their site back on the right track after being negatively affected by Google’s algorithm updates.
The disavow links tool was created with the knowledge that a lot of site owners have fallen into the trap of purchasing links on spammy directories and other unnatural link building practices. Though Google does not condone this, they understand that people make mistakes and should have a chance to redeem themselves.