Who are you?

It took me a while, but as promised I am back on the topic of identity and anonymity in the modern digital world.

Made-up factoid: the average American visits a new website and creates a new log-on and password for himself once every four days. I have lost count of the number of websites which have asked me the apparently innocuous question of what I want my log-on name to be. It's maddening, the constant requirement to define myself. What do you choose? The name your parents gave you? An old nickname? A reference to something you're all geek about? What you want to be? What you want others to think you are? As if defining oneself in the anarchistic vacuum we know as modern life wasn't difficult enough.