Introduction of Disavow Link By Matt Cutts

“You might have been doing blog spam, comment spam, forum spam, guestbook spam…maybe you paid somebody to write some low quality articles and syndicate those all over the place with some very keyword rich anchor text, and maybe Google sent you a message that says, ‘We’ve seen unnatural links to your site or we’ve taken targeted action on some of the unnatural links to your site,’ and so as a result, you want to clean up those backlinks,” Cutts says in the video.