Google Knows Us Very Well

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Google is the most widely used search engine in the world. Besides, Google do offers other free services such as Gmail, Blogger etc. But do you know that Google collects your information while you are using such services? I myself doesn't mind giving out my personal information, but this video seems to be telling us that Google might be evil soon. I sucks at describing, why not watch it yourself?Here you are: http://www.youtube.com/watch?v=9zKXCQpUnMg