Google has recently announced the Google Panda 4.0 http://searchengineland.com/google-begins-rolling-panda-4-0-now-192043 Please read this blog post too: http://searchengineland.com/officia...hm-2-0-launched-targets-spammy-queries-192027
Truthfully, I don't listen to any of that stuff and continually rank sites. Just look at the current top 10 for your keywords. They've passed all the algorithms and are working. Just emulate them in terms of onsite and offsite seo.
Google always update their rules and regulation. SEO is their major one of them. Google thinks SEO is a new curriculum for a new generation. So we always update our website for google rules. I think SEO is the best because Google always with us. webmasteralouer.ch/creation-site-web-lausanne