More than a year after the previous Penguin update (2.1), Google launched a Penguin refresh. This update appeared to be smaller than expected (<1% of US/English queries affected) and was probably data-only (not a new Penguin algorithm). The timing of the update was unclear, especially internationally, and Google claimed it was spread out over "weeks".
Google AutoCorrects: Penguin 3.0 Still Rolling Out & 1% Impact (SER)
Penguin 3.0 Analysis – Penguin Tremors, Recoveries, Fresh Hits, and Crossing Algorithms (GSQi)
