Microsoft already bought a chunk of Facebook—$240 million worth back in 2007. That purchase gave Facebook an implied valuation of $15 billion. http://www.nyti

Microsoft already bought a chunk of Facebook—$240 million worth back in 2007. That purchase gave Facebook an implied valuation of $15 billion. http://www.nytimes.com/2007/10/25/technology/24cnd-facebook.html http://www.nytimes.com/2007/10/25/technology/24cnd-facebook....