Prevent comment spam Understanding the importance of comment spam and how to prevent it. Scraped content Examples of scraped content that should be avoided. Automatically generated content Guidelines to avoid being penalized for auto-generated content. Avoid irrelevant keywords Why irrelevant keywords should be avoided, including examples that could result in the site being penalized. Avoid cloaking Brief introduction to cloaking, including examples of what should be avoided. Avoid link schemes Introduction to link schemes, including examples. Avoid hidden text and links Examples of deceptive and valid hidden text. Avoid sneaky redirects Introduction to 'sneaky redirects', including examples and how to avoid being penalized.