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Gmail Priority Inbox: Complex algorithmic solution that uses your behavior and ratings to determine which messages are important.

Facebook Messages: Tell us who your friends are -- those messages are important.

Love the contrast, and think each speaks volumes about the company behind it.

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Both companies are integrating the other's approach to have a more holistic solution. Facebook prioritizes news messages from your closest friends, by measuring your interaction with them. And of course Google Me is going to be something interesting.

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