What did the recent update, Penguin 2.1, do or change in the ranking factors? Is there some type of backlink that I should not be building now that 2.1 is out?
How does Google Penguin 2.1 relate to hummingbird? I've already removed a lot of my links but it looks like I'm still losing rank for one of my sites. I'm unsure how to bring it back up now that I've been slapped by Google again.