I would like to share this interesting content about "Google Webmaster Tools just got a lot more important for link discovery and clean up" posted by Robert Fisher from the Moz blog site. I think this article has got to do with the upcoming Google Penguin 3 update. Kindly visit this link for your reference and study the most important aspects for link discovery and clean up. Google Webmaster Tools Just Got a Lot More Important for Link Discovery and Cleanup - Moz