“You have one identity,” he emphasized three times in a single interview with David Kirkpatrick in his book, “The Facebook Effect.” “The days of you having a different image for your work friends or co-workers and for the other people you know are probably coming to an end pretty quickly.” He adds: “Having two identities for yourself is an example of a lack of integrity.”
No more sharing your Saturday night plans with only your friends, you must also tell your mother...and your mother-in-law. It's a lack of integrity not to tell your boss about your private life. At least if Facebook is in charge.
Mr. Zuckerberg has never been stalked, and wanted to hide his online life from the stalker. He's never had an intrusive parent violate his boundaries. He's never been annoyed by dozens of A/S/L requests (and worse) from random strangers. You're not allowed to strive to be a better person through "acting as if" in his world, you have to show everybody exactly who you are right now, all your faults and flaws and mistakes published (if at all) to everyone you know.
If you used to keep your hobby private from your co-workers and employer (after all, it was neither pertinent to work nor anybody's business), Mr. Zuckerberg believes you have no integrity. He floats in a world without context and without boundaries, where every thought and action can and should be shared with every member of your various communities--and where there are no dangerous consequences from so doing.
He has the right to impose his standards on you, since you use his service free. If you don't agree, you're free to stop using it and delete your account. That's what I'm going to do.