writes "The Alexa ranking system is naturally flawed. The data should never be treated as accurate, as it's easily manipulated, and not supported for most browsers in the world. It's an estimate, and nothing more.
I've been saying that forever, but unfortunately for me, since it's a number on a website that is considered "Real" to some, I'm supposed to take it seriously. I imagine this is a problem for many webmasters out there.