From a read-worthy article in The Atlantc by Derek Thompson:

"[...] Zuckerberg's diagnosis of our Brave New World of diminishing privacy is utterly self-serving. The more information that Facebook users share, the more information Facebook can vacuum into whatever ad-based revenue stream they're debuting this quarter.

Facebook is trapped by its own conventions, too. It's a social networking site, a goldmine of private information. Like a Middle Eastern country sitting on top of an ocean of oil, Facebook feels a business-driven pressure to let outsiders (ad companies) drill deep into their reserves, so they can shove Coldplay tickets in front of Coldplay fans and job listings in front of college seniors, and so forth. Facebook's incentive is entirely to move toward more openness.

It's one thing to admit that a business is a business. It's another to pretend that your business objectives just happen to line up perfectly with your users' wishes, when you know very well that the opposite is true."
http://business.theatlantic.com/2010/01/facebook_does_not_understand_the_meaning_of_privacy.php