[ksaj]

This reminds me of the TOR service that tells you how unique your presence is on the network, based on a whole lot of things the browser reports.

Sometimes it'll be a single font that gives a person away, even when so many other bits of information are essentially the same.

It works pretty much exactly like how Akinator The Mind Reading Genie works. You narrow down by various yes and no answers, and get to the right answer, or a very close subset, surprisingly quickly.