Core Ranking Algorithm Behind The Fluctuations, Not Penguin Update

[Brainpulse]

Googlers Zineb, Garry Illyes and John Mueller tweeted and confirmed that those ranking swings past weekend were due to a core ranking algorithm that Google rolled out quietly, and not because of penguin. Find more details here : http://www.brainpulse.com/articles/seo-sem/core-ranking-algorithm-penguin-update.php