Can Facebook change from a private to public social space?

In another gutsy (though perhaps misguided) move, Facebook is encouraging all its users to go public with their and statuses and other information. The motivation is clear – take on Twitter, and partly Google. Become a bigger part of the open web.

I will leave others to analyze the privacy implications (which are many). I am interested in a different aspect – is it possible to change from a private social space to a public social space. Can a living room become a bar, or a nook become a public park? Yes, you can encourage individual users to change their preference, but a social space is more than the sum of individual user preferences. For example, Twitter lets users be private. But it is predominantly used as a public space. Similarly social spaces are generally public or private.

If I change my statuses from private to public, then do the expectancies of those around me change as well? What about the interactions between someone who is private and another person who is public?

I think its going to be hard for Facebook to make this change and remain the type of trusted social space they have become. Time will tell, but I am predicting that either the change will not have a major impact (people will stay private), or there will be a backlash.