Explain me please about Google back-link policy depend on Penguin update?
Thanks everybody for the attention. I have a PR4 website and it had Domain Authority 33 before the last Domain Authority update. But unfortunately it is now only 23 tough I managed many blogrolls , manual social bookmarks and huge & quality social sharing. But my site penalized. I am feeling hopeless at the moment. Please explain about Penguin in detail. Thanks.