Here is number 2 and 3 explaining what a Google “Panda” algorithym targets.
2. Low-quality content. This means content that hurts you to even look at it, let alone read. Poorly formatted text with grammar errors, huge or otherwise distracting images, design that negatively affects a user’s experience – anything you suspect will rub users the wrong way, will. Their visit to your site should be enjoyable.
3. Unhelpful, untrustworthy content. The kind that doesn’t help the users who found it or causes outright harm. Google has no tolerance for incompetence and con artistry. Strive to be a positive force.
More coming tomorrow.