Imagine that you want to sue someone for what they wrote, anonymously, in a web-based online forum. To succeed, you'll first have to figure out who they really are. How hard is that task? It's a question that Harlan Yu, Ed Felten, and I have been kicking around for several months. We've come to some tentative answers that surprised us, and that may surprise you.
Tracking down anonymous online identities
Easier than you think. Way easier.