"The Microsoft agreement comes after intense lobbying by Microsoft and Google Inc. for Facebook's hand. In recent weeks executives including Microsoft Chief Executive Steve Ballmer have courted the three-year-old Palo Alto, Calif. company, which this year expects a profit of $30 million on revenue of $150 million, according to people familiar with the company."
Bad news for Facebook users and developers who will find the lock-in that pervades anything MS touches will eventually lock them out. Why FB management would rather not do business with Google is a mystery. Oh wait, they are only interested in money, and may actually take delight in screwing users. That would explain it.
What's the REAL reason they only want REAL names? Because to allow anything else will subvert their advertising plans (such as they are). Eventually using Facebook without giving up your life story will not be practical. Wait and see.