RankWatch Community Forum

Google Panda-

Google Panda was launched on February 2011. This algorithm was launched with the purpose of change in search engine ranking system. The idea underlying the update was simple decrease the rankings of sites use the low quality or thin content. 

The number of websites were using huge amount of advertising with low quality/spin/duplicate content before Panda. So reduce such type of spamming, Google updates its algorithm and launched Panda to increase the quality of search results.

Google panda updates till date-

1) Panda 1 ( Feb 23rd, 2011)

2) Panda 2.0 (April 11, 2011)

3) Panda 2.1 (May 9, 2011)

4) Panda 2.2 (June 21, 2011)

5) Panda 2.3 (July 23, 2011)

6) Panda 2.4 (August 12, 2011)

7) Panda 2.5 ( September 28, 2011)

8) Panda 3.0 ( October 13, 2011)

9) Panda 3.1 (November 18, 2011)

10) Panda 3.2 (December 19, 2011)

11) Panda 3.3 (February 27th, 2012)

12) Panda 3.4 (March 24th, 2012)

13) Panda 3.5 (April 19th, 2012)

14) Panda 3.6 (April 27th, 2012)

15) Panda 3.7 ( June 11th, 2012)

16) Panda 3.8 (June 26th, 2012)

17) Panda 3.9 (July, 2012)

18) Panda 4.0 (July 25th-26th 2012)

19) Panda 20th Update (27th September 2012)

20) Panda 21st Update (November 5th, 2012)

21) Panda 22 (November 22nd, 2012)

22) Panda 23  (December 21-22, 2012)

Source- http://www.shoutmeloud.com/google-algorithm-updates-changes-1998-2012.html

If you have following points in your site, you may hit by Google Panda-

1) Low quality content

2) If site having duplicate content/thin Content

3) If you site works as content farm

4) If you have outdated content

5) If useless page are indexed in Google

6) If your site has improper design and SEO structure

7) Too many ads on the site

8) If your site containing poor grammar 

9) Poor webpage loading time

10) Spammy comments in blogs/forums

11) Poor external links in your website

12) Too many 404 links

Google Penguin-

Google Penguin launched on 24th April 2012. Penguin was mainly launched to target the Webspam. The change will decrease rankings for sites those breach the guidelines of Google quality. 

This algorithm is designed to penalize those who cheat with Google and get ranking by using black hat seo techniques.

Google has rolled out the following updates till now-

1) Penguin Update (April 24th 2012)

2) Penguin 1.1( May 25th 2012)

3) Penguin #3 (October 9th 2012)

4) Penguin 2.0 (May 22nd, 2013)

5) Penguin 2.1 (October 4th, 2013)

If you have below type of links in your backlink profile, you will definitely arrest by Penguin-

1) Excessive Reciprocal link exchanges

2) Paid links

3) Links with over optimized anchor texts

4) Links from websites that have been penalized by Google

5) Links from websites with low page rank

6) Links from irrelevant and untrustworthy sites

7) Links from blog networks

8) Automated link

9) Site-wide links/ Footer links

10) Affiliate Links

11) Buying and selling links that pass PageRank

12) Text advertisements that pass PageRank