On  April 24th, Google launched the Penguin update to their algorithm that  reduced traffic to a significant number of sites. Here are some great  resources for learning more about Google Penguin.
Key takeaways: Export link data from Open Site Explorer to identify  overused anclklhor text links. Penguin seems to be a keyword specific  algorithm rather than a sitewide algorithm. It doesn’t help to send a  reinclusion request because it is an algorithm, not a penalty. Google  deindexed free directories around the middle of May.
Key takeaway: Avoid being too aggressive with exact match anchor text links.
Key takeaways: Diversify your inbound traffic to sources outside  Google like social media. Business owners should spend 5 times as much  time on other websites than on their own site.
Key takeaways: Google confirms that the Penguin update is fully live.  Penguin is an algorithmic change (not a manual penalty). Panda 3.5 was  released on April 19th.
Key takeaways: Focus on creating remarkable content for potential  customers. Make sure to verify your site Google Webmaster Tools to check  for any warning messages. Avoid hidden text or links and keyword  stuffing.
Key takeaway: Anchor text is much less of a linking factor than in  the past. Make sure at least 50% of your links use keywords that are not  the keyword you are trying to rank for.
Key takeaway: Some linking factors that may have triggered Penguin  are comment spam with exact match anchor text links, article  marketing/article directories, and guest posts on questionable sites.  The common denominator appears to be unnatural links.
Key takeaway: Avoid linking to bad neighborhoods as it can negatively  affect your site. Avoid excessive link exchanges/reciprocal links.
 Key Takeaways: Don’t make a lot of changes to your site in a  panic-driven state. Make sure you have a mix of anchor text links from  other sites including brand anchor text, exact match, and phrase match.
 

 
