Lots of ruckus about Microsoft’s $240 million investment, supposedly valuing Facebook at $15 billion.

Microsoft’s original ad deal was for 3 years (ending in 2009). That was their original relationship with Facebook.

So Microsoft spent $240 million and got 1.6% of Facebook. That means $240 million / 0.016 = Facebook valued at $15 billion right?

To rip from Techcrunch (with added emphasis):

It will invest $240 million in Facebook and expand its existing relationship to international markets, according to the WSJ. (The previous advertising relationship was only for the U.S., now Microsoft is Facebook’s exclusive advertising partner both in the U.S. and abroad until 2011)

So not only was there 1.6% of Facebook given up to Microsoft, but (which everyone seems to miss) - the ad relationship was expanded and extended to 2011.

Microsoft doesn’t value Facebook at $15 billion. It values 1.6% of Facebook and an expanded and extended ad deal at $240 million. That’s it. You can’t ignore the ad deal and magically come to a $15 billion valuation.

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