Google Penguin 2.1 Explained

Penguin 2.1 was announced this past week by Google’s head of search spam, Matt Cutts.  2.1 is not an update in the pre-Hummingbird sense.  Hummingbird was a re-haul of the whole algorithm and contains much of the important logic of the past Penguin and Panda updates.   Penguin 2.1 is a small part of the search [...]