History of Panda Google Algorithm Updates

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Panda/Farmer Update
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Each year, Google changes its search algorithm
around 500600 times. While most of these changes
are minor, Google occasionally rolls out a
"major" algorithmic update (such as Google Panda
and Google Penguin) that affects search results
in significant ways.
Here, weve listed the major algorithmic changes
that have had the biggest impact on search.
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1. Panda/Farmer - February 23, 2011
A major algorithm update hit sites hard,
affecting up to 12 of search results (a number
that came directly from Google). Panda rolled out
over at least a couple of months, hitting Europe
in April 2011.
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2. Panda 2.0 (2) - April 11, 2011
Google rolled out the Panda update to all English
queries worldwide (not limited to
English-speaking countries). New signals were
also integrated, including data about sites users
blocked via the SERPs directly or the Chrome
browser.
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3. Panda 2.1 (3) - May 9, 2011
Initially dubbed Panda 3.0, Google appeared to
roll out yet another round of changes. These
changes werent discussed in detail by Google and
seemed to be relatively minor.
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4. Panda 2.2 (4) - June 21, 2011
Google continued to update Panda-impacted sites
and data, and version 2.2 was officially
acknowledged. Panda updates occurred separately
from the main index and not in real-time,
reminiscent of early Google Dance updates.
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5. Panda 2.3 (5) - July 23, 2011
Webmaster chatter suggested that Google rolled
out yet another update. It was unclear whether
new factors were introduced, or this was simply
an update to the Panda data and ranking factors. 
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6. Panda 2.4 (6) - August 12, 2011
Google rolled Panda out internationally, both
for English-language queries globally and
non-English queries except for Chinese, Japanese,
and Korean. Google reported that this impacted
6-9 of queries in affected countries.
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7. Panda 2.5 (7) - Sept 28, 2011
After more than month, Google rolled out another
Panda update. Specific details of what changed
were unclear, but some sites reported large-scale
losses.
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8. Panda "Flux (8) - Oct 5, 2011
Matt Cutts tweeted "expect some Panda-related
flux in the next few weeks" and gave a figure of
"2". Other minor Panda updates occurred on
10/3, 10/13, and 11/18.
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7. Panda 3.1 (9) - Nov 18, 2011
After Panda 2.5, Google entered a period of
"Panda Flux" where updates started to happen more
frequently and were relatively minor. Some
industry analysts called the 11/18 update 3.1,
even though there was no official 3.0. For the
purposes of this history, we will discontinue
numbering Panda updates except for very
high-impact changes.
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10. Panda 3.2 (10) - Jan 18, 2012
Google confirmed a Panda data update, although
suggested that the algorithm hadn't changed. It
was unclear how this fit into the "Panda Flux"
scheme of more frequent data updates.
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11. Panda 3.3 (11) - Feb 27, 2012
Google rolled out another post-"flux" Panda
update, which appeared to be relatively minor.
This came just 3 days after the 1-year
anniversary of Panda, an unprecedented lifespan
for a named update.
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12. Panda 3.4 (12) - Mar 23, 2012
Google announced another Panda update, this time
via Twitter as the update was rolling out. Their
public statements estimated that Panda 3.4
impacted about 1.6 of search results.
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13. Panda 3.5 (13) Apr 19, 2012
In the middle of a busy week for the algorithm,
Google quietly rolled out a Panda data update. A
mix of changes made the impact difficult to
measure, but this appears to have been a fairly
routine update with minimal impact.
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14. Panda 3.6 (14) - Apr 27, 2012
Barely a week after Panda 3.5, Google rolled out
yet another Panda data update. The implications
of this update were unclear, and it seemed that
the impact was relatively small.
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15. Panda 3.7 (15) June 8, 2012
Google rolled out yet another Panda data update,
claiming that less than 1 of queries were
affect. Ranking fluctuation data suggested that
the impact was substantially higher than previous
Panda updates (3.5, 3.6).
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16. Panda 3.8 (16) - Jun 25, 2012
Google rolled out another Panda data refresh, but
this appeared to be data only (no algorithm
changes) and had a much smaller impact than Panda
3.7.
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17. Panda 3.9 (17) Jul 24, 2012
A month after Panda 3.8, Google rolled out a new
Panda update. Rankings fluctuated for 5-6 days,
although no single day was high enough to stand
out. Google claimed 1 of queries were impacted.
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18. Panda 3.9.1 (18) - Aug 20, 2012
Google rolled out yet another Panda data update,
but the impact seemed to be fairly small. Since
the Panda 3.0 series ran out of numbers at 3.9,
the new update was dubbed 3.9.1.
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19. Panda 3.9.2 (19) Sep 18, 2012
Google rolled out another Panda refresh, which
appears to have been data-only. Ranking flux was
moderate but not on par with a large-scale
algorithm update.
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20. Panda 20 (20) Sep 27, 2012
Overlapping the EMD update, a fairly major Panda
update (algo data) rolled out,
officially affecting 2.4 of queries. As the 3.X
series was getting odd, industry sources opted to
start naming Panda updates in order (this was the
20th).
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21. Panda 21 (21) Nov 5, 2012
Google rolled out their 21st Panda update,
roughly 5-1/2 weeks after Panda 20. This update
was reported to be smaller, officially impacting
1.1 of English queries.
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22. Panda 22 (22) Nov 21, 2012
After some mixed signals, Google confirmed the
22nd Panda update, which appears to have been
data-only. This came on the heels of a larger,
but unnamed update around November 19th.
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23. Panda 23 (23) Dec 21, 2012
Right before the Christmas holiday, Google rolled
out another Panda update. They officially called
it a "refresh", impacting 1.3 of English
queries. This was a slightly higher impact than
Pandas 21 and 22.
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24. Panda 24 (24) Jan 22, 2013
Google announced its first official update of
2013, claiming 1.2 of queries affected. This did
not seem related to talk of an update around
1/17-18 (which Google did not confirm).
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25. Panda 25 (25) Mar 14, 2013
Matt Cutts pre-announced a Panda update at SMX
West, and suggested it would be the last update
before Panda was integrated into the core
algorithm. The exact date was unconfirmed, but
MozCast data suggests 3/13-3/14.
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26. Panda 4.0 (26) 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.
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27. Panda 4.1 (27) Sep 23, 2014
Google announced a significant Panda update,
which included an algorithmic component. They
estimated the impact at 3-5 of queries affected.
Given the "slow rollout," the exact timing was
unclear.
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27. Panda 4.1 (27) Sep 23, 2014
Google announced a significant Panda update,
which included an algorithmic component. They
estimated the impact at 3-5 of queries affected.
Given the "slow rollout," the exact timing was
unclear.
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