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If the pre-money valuation really reaches $15 billion (New York Post claims it's $10-$15 billion), it means that Google or Microsoft would have to dish out approximately $1.5 billion for a 10 percent stake in Facebook.
Remember when Yahoo's one billion offer for Facebook seemed like a lot of money? Well, it's a whole new ball game right now.
According to New York Post, the deal will be made in the next one or two days, and Google seems to be winning (read: more willing to dish out an insane amount of cash). Other sources, claims the Post, say that Microsoft is willing to offer "any price" to keep Google from buying a piece of Facebook.
The game's on; we'll report on any further developments promptly.