You would think that with the popularity of Google's search engine, Gmail, Maps, Docs, and all of the company's other web apps, it would know everything about us by now. Millions of us have Android devices in our pockets capable of transmitting our location to Google servers every second of the day. But there's one thing Google hasn't been able to pin down just yet--our opinions. It wants to know these enough to pay us (kind of) for the information.

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