Google updated algorithm for back links by penguin. This update may impact your website strongly or light based on your back links. This is one type of penguin update.

When did this penguin update happen? Please let me know more information about this update,I am not getting any penguin updated info recently.

Two days before Barry told in seroundtable. Refer comments in that topic on 14 apr2014.

I have gone through the post,it is about Google softer panda update.Not penguin update.Anyways thank you for the information.