Turns out, by using a particular random function on your network, you can use your chat client to communicate with conceptual ideals. I never would have discovered that, if I hadn't received a chat request. It was from the version of myself who, in every serious and uncertain decision in my life, had taken the other choice. He seemed happy, and interesting, but we didn't have a lot in common.
Which is why I subscribed him to as many spam lists as possible.