[4] 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.
But I believe it was the right decision to launch Panda, both for the long-term trust of our users and for a better ecosystem for publishers.
"[2] Google's Panda received several updates after the original rollout in February 2011, and their effect went global in April 2011.
To help affected publishers, Google provided an advisory on its blog,[6] thus giving some direction for self-evaluation of a website's quality.
Google has provided a list of 23 bullet points on its blog answering the question of "What counts as a high-quality site?"