What difference does it make? The same principles would apply if we were talking about My Space or Yahoo or A2K.
If you are operating on the assumption that facebook interaction is the same as those sites listed, then you've illustrated my point quite well. You can't forget that in this new web culture, websites have their own character, and are quite unique.
They all have unique characteristics. The way people interact on FB is very different than places like here. As a recent college grad, I was a part of the whole generation figuring out what to do with this new level of social documentation in regards to professionalism etc. FB keeps reinventing itself, and new privacy AND sharing solutions become more and more available. I'm not telling anyone to go put whatever they want on their facebook, but I'm not going to stand by some ridiculous notion that school teachers must suffer poor wages on top of sacrifices in expression.
Businesses are getting FB accounts.
Obama and McCain did an incredible amount of campaigning using FB.
FB itself is an odd entity as it is almost the internet inside of the internet. A sort of 2nd order recursive universe. However unlike meta-spaces like video games, you are playing as yourself.
Certainly people could use an alternate name, but I think the exciting part of FB is how people see what others are doing and how they share.
I ask if you have a FB for a very legitimate reason. It doesn't mean you can't have an opinion, it just means that you can be honest that your opinion comes second hand.
Culturally speaking, I think about when I interviewed for jobs out of college. The temptation was too take out my earrings. The fear was that it would not be perceived as professional. I choose not to. The company would take me as is, or not at all. I planned to wear them everyday while working. I wanted to interview exactly as they would have me. I bring this up because there is this notion of what is an isn't professional that extends far too deep into people's life (both privately and publicly). If a company has expectations like that when you're not at work, then they can give out overtime. Otherwise, they can deal with it.
There are obvious exceptions where ethics are involved (A cop with pictures of them breaking a law etc). If the acts in the photos aren't criminal, then lets stop treating them as such.