Official Google answers to common SEO questions

Question:

What is Google's thinking about links from article marketing, widgets, etc?

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Question	Views
What happens if I link to a good page that later becomes spammy?	1,772
Will Google remove a page that I don't like from its search results?	1,660
Should I disallow Googlebot from crawling slower pages?	1,671
Is data about the sites that users block being used in ranking?	1,546
How does Google use human raters in web search?	1,630
Does Google try to return results based on signals other than popularity?	1,563