Google Panda!
 

Google Panda is a change to the Google's search results ranking algorithm that was first released in February 2011.The change aimed to lower the rank of "low-quality sites", and return higher-quality sites near the top of the search results.CNET reported a surge in the rankings of news websites and social networking sites, and a drop in rankings for sites containing large amounts of advertising.This change reportedly affected the rankings of almost 12 percent of all search results.Soon after the Panda rollout, many websites,including Google's webmaster forum, became filled with complaints of scrapers/copyright infringers getting better rankings than sites with original content. At one point, Google publicly asked for data points to help detect scrapers better. Google's Panda has received several updates since the original rollout in February 2011, and the effect went global in April 2011. To help affected publishers, Google published an advisory on its blog, thus giving some direction for self-evaluation of a website's quality.

I don't know how to top rank

You are very right about google panda and how it destroy the websites which have low quality contents... It have the solution how to avoid google panda plenty... Cheers...

Its a enhancement to Google search formula which allows the search engines to deal with content thieves and spammers. Keep in mind the search engines caffeine? This upgrade is just like coffee upgrade but it might not effect to most of customers same

Google panda is the update in Google search engine algorithm to get the better rank for the website.

The first Google panda update on 24 feb 2011

Thanks for sharing this information about google panda.