Fluctuation in Google Page Rank and Google Update in 19 December :

 The key indicator and I checked web master world or SEO chatter and some other seo forums google little bit change in Google Panda then it's result the thousands of web site update it's google page rank. Over few months Google fluctuating it's search algorithms result that web site affect in search engine result page in some keyword and earn the traffic. Earlier Google lunch it's content promoting algorithms.

Google has not given an ETA to this launch, and I don't expect them to. But with any winners, in this case the "good guys", others will see loses. So while this algorithm may be about promoting content, some content will ultimately drop in the results because of it.