Alexis Madrigal makes the case that Google+ and Facebook are asking us, as members of society, to do something we’ve never done before:
Every statement you make on Google Plus or Facebook is persistent and strongly attached to your real identity through your name. Both services allow you to change settings to make your statements more or less public, which solves some problems. However, participating in public life on the services requires attaching your name to your statements. On the boulevards and town squares of Facebook, you can’t just say, “Down with the government,” with the knowledge that only a small percentage of the people who hear you could connect your statement to you. But the information is still being recorded, presumably in perpetuity. That means that if a government or human resources researcher or plain old enemy wants to get a hold of it, it is possible.
The pseudonym advocates note that being allowed to pick and choose a different name solves some of these problems. One can choose to tightly couple one’s real-world identity and online identity… or not. One can choose to have multiple identities for separate networks. In the language we were using earlier, pseudonyms allow statements to be public and persistent, but not attached to one’s real identity.