Matt Cutts has confirmed that Google rolled out their latest algorithm change dubbed Penguin 2.0 on May 22nd 2013. This change capitalises and goes further than the Penguin 1.0 change rolled out in 2012. The aim of this update is to prevent spam sites ranking, whilst putting emphasis on quality content and excellent user experience of real sites.

Penguin 2.0 Rolled Out May 22 2013