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Facebook takes on Google and Yahoo in Web messages

<p>Facebook CEO Mark Zuckerberg speaks during a news conference where he unveiled a new messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith</p>

Facebook CEO Mark Zuckerberg speaks during a news conference where he unveiled a new messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

Facebook CEO Mark Zuckerberg speaks during a news conference where he unveiled a new messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

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<p>Facebook CEO Mark Zuckerberg speaks during a news conference where he unveiled a new messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith</p>

Facebook CEO Mark Zuckerberg speaks during a news conference where he unveiled a new messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

Facebook CEO Mark Zuckerberg speaks during a news conference where he unveiled a new messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

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<p>Facebook CEO Mark Zuckerberg speaks at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith</p>

Facebook CEO Mark Zuckerberg speaks at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

Facebook CEO Mark Zuckerberg speaks at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

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<p>Facebook CEO Mark Zuckerberg arrives at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith</p>

Facebook CEO Mark Zuckerberg arrives at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

Facebook CEO Mark Zuckerberg arrives at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

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<p>Facebook CEO Mark Zuckerberg speaks at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith</p>

Facebook CEO Mark Zuckerberg speaks at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

Facebook CEO Mark Zuckerberg speaks at a news conference where he unveiled a new Facebook messaging system in San Francisco, California November 15, 2010. REUTERS/Robert Galbraith

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