
2014 Updates
Panda 4.0 — May 19, 2014
Google confirmed a major Panda update that likely included both an algorithm update and a data refresh. Officially, about 7.5% of English-language queries were affected. While Matt Cutts said it began rolling out on 5/20, our data strongly suggests it started earlier.
Payday Loan 2.0 — May 16, 2014
Just prior to Panda 4.0, Google updated it's "payday loan" algorithm, which targets especially spammy queries. The exact date of the roll-out was unclear (Google said "this past weekend" on 5/20), and the back-to-back updates made the details difficult to sort out.
Unnamed Update — March 24, 2014
Major algorithm flux trackers and webmaster chatter spiked around 3/24-3/25, and some speculated that the new, "softer" Panda update had arrived. Many sites reported ranking changes, but this update was never confirmed by Google.
Page Layout #3 — February 6, 2014
Google "refreshed" their page layout algorithm, also known as "top heavy". Originally launched in January 2012, the page layout algorithm penalizes sites with too many ads above the fold.
source: http://moz.com/
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