Randi Zuckerberg, marketing director and co-founder of Facebook said:

I think anonymity on the Internet has to go away… People behave a lot better when they have their real names down. … I think people hide behind anonymity and they feel like they can say whatever they want behind closed doors.

<irony> This of course explains why no one is a jerk or a bully on Facebook. </irony>

I have been doing this Anonymity thing for much longer than Facebook has existed. I have seen the debates and watched the reality. I am convinced that the problem is that most Internet spaces are impersonal, rather than that they are anonymous. People will be outrageously rude and offensive online while being unfailingly courteous in person, even if both situations are in real name.

In reality, most "real world" interactions are functionally anonymous, yet most of us behave most of the time.

I won't even get in to how terrible her idea would be for people under repressive regimes.

Facebook: “Anonymity on the Internet has to go away” | ZDNet