04/10/2013
Google releases its fifth update for its original webspam-fighting algorithm, Penguin. This Penguin update is using a slightly improved version of Google's Penguin 2.0" (Google Penguin 4) technology.
Google called this update "Penguin 2.1." The minor update to the previous release is improving its filters. The new Penguin looks for websites that previous releases "missed", look deeper into spam possibilities, particularly sites that may have purchased paid links.
To recover from Penguin penalties, webmaster/web owners, need to disavow bad links or manually have those removed.