Quality Links are valuable and mostly penguin is always updated on the basis of rich Content Quality.
Penguin update is the google' algo to tackle the spam, here is the link for you, read this and you will get what you want :http://www.seomoz.org/blog/how-wpmuorg-recovered-from-the-penguin-update
Penguin update from google is to penalize the low quality site based on links and site content. Most of the site drastically lost its ranking on search engine. Do build quality links and make sure about quality of the content.
I don't care about all google algo, update,. whatever,. such as penguin, etc,. I still writing, to make quality contents. so, I still enjoy with my blog,. and I think it's the best why to do for publisher
The most important thing to do is to build links with an anchor text profile that looks natural and not spammy.
As we know that Google has recently released its Google Penguin also known as Web Spam Google Algorithm Update.Google has clearly said that this algorithm change is to filter out those websites which is overly optimized.Penguin update from google is to penalize the low quality site based on links and site content. Most of the site drastically lost its ranking on search engine. Do build quality links and make sure about quality of the content. I am trying to share some initial level tips to recover from Google Penguin Penalty. 1-Avoid Un-natural Link Building 2-Avoid keyword stuffing 3-Follow Google Guideline 4-Check Google Webmaster for notification