db: There are sort of four properties and one key practice that are fundamentally different online. The key practice is that you have to write yourself into being. To a certain degree we do this offline as well, whereby you have a body that you're working with that you then accessorize to hell. Online you don't have a body, you don't have a presence, you don't have anything that sort of marks your existence.
There are four functions that are sort of the key architecture of online publics and key structures of mediated environments that are generally not part of the offline world. And those are persistence, searchability, replicability, and invisible audiences. Persistence -- what you say sticks around. Searchability -- my mother would have loved the ability to sort of magically scream into the ether to figure out where I was when I'd gone off to hang out with my friends. She couldn?t, thank God. But today when kids are hanging out online because they've written [themselves] into being online, they become very searchable. Replicability -- you have a conversation with your friends, and this can be copied and pasted into your Live Journal and you get into a tiff. That creates an amazing amount of "uh ohs" when you add it to persistence. And finally, invisible audiences. In unmediated environment, you can look around and have an understanding of who can possibly overhear you. You adjust what you're saying to the reactions of those people. You figure out what is appropriate to say, you understand the social context. But when we're dealing with mediated environments, we have no way of gauging who might hear or see us, not only because we can't tell whose presence is lurking at the moment, but because of persistence and searchability.