It's here Penguin 4.0, and now updates in real time. We going to explain what that means.
We still have knowledge that back-links are still important. Always making sure does back-links are from strong source. Need to be from high quality website and if this back-link came from revelant website even better.
We also read that it's running in real time, something great for search engine results on point.
For information about google Penguin 4.0 Update Click Here